CHEMICALS USED IN HYDRAULIC FRACTURING

UNITED STATES HOUSE OF REPRESENTATIVES
COMMITTEE ON ENERGY AND COMMERCE
MINORITY STAFF
APRIL 2011
CHEMICALS USED IN HYDRAULIC FRACTURING
PREPARED BY COMMITTEE STAFF FOR:
Henry A. Waxman
Ranking Member
Committee on Energy
   and Commerce
Edward J. Markey
Ranking Member
Committee on Natural
   Resources
Diana DeGette
Ranking Member
Subcommittee on Oversight
   and Investigations TABLE OF CONTENTS
I.     EXECUTIVE SUMMARY............................................................................1
II.   BACKGROUND.............................................................................................2
III. METHODOLOGY........................................................................................4
IV. HYDRAULIC FRACTURING FLUIDS AND THEIR CONTENTS…..5
A. Commonly Used Chemical Components..................................................6
    B.  Toxic Chemicals………….......................................................................8
V.  USE OF PROPRIETARY AND “TRADE SECRET” CHEMICALS.....11
VI.  CONCLUSION..............................................................................................12
APPENDIX A.........................................................................................................131
I. EXECUTIVE SUMMARY
Hydraulic fracturing has helped to expand natural gas production in the United States,
unlocking large natural gas supplies in shale and other unconventional formations across the
country.  As a result of hydraulic fracturing and advances in horizontal drilling technology,
natural gas production in 2010 reached the highest level in decades.  According to new estimates
by the Energy Information Administration (EIA), the United States possesses natural gas
resources sufficient to supply the United States for approximately 110 years.  
As the use of hydraulic fracturing has grown, so have concerns about its environmental
and public health impacts.  One concern is that hydraulic fracturing fluids used to fracture rock
formations contain numerous chemicals that could harm human health and the environment,
especially if they enter drinking water supplies.  The opposition of many oil and gas companies
to public disclosure of the chemicals they use has compounded this concern.
Last Congress, the Committee on Energy and Commerce launched an investigation to
examine the practice of hydraulic fracturing in the United States.  As part of that inquiry, the
Committee asked the 14 leading oil and gas service companies to disclose the types and volumes
of the hydraulic fracturing products they used in their fluids between 2005 and 2009 and the
chemical contents of those products.  This report summarizes the information provided to the
Committee.  
Between 2005 and 2009, the 14 oil and gas service companies used more than 2,500
hydraulic fracturing products containing 750 chemicals and other components.  Overall, these
companies used 780 million gallons of hydraulic fracturing products – not including water added
at the well site – between 2005 and 2009.  
Some of the components used in the hydraulic fracturing products were common and
generally harmless, such as salt and citric acid.   Some were unexpected, such as instant coffee
and walnut hulls.  And some were extremely toxic, such as benzene and lead.  Appendix A lists
each of the 750 chemicals and other components used in hydraulic fracturing products between
2005 and 2009.  
The most widely used chemical in hydraulic fracturing during this time period, as
measured by the number of compounds containing the chemical, was methanol.  Methanol,
which was used in 342 hydraulic fracturing products, is a hazardous air pollutant and is on the
candidate list for potential regulation under the Safe Drinking Water Act.  Some of the other
most widely used chemicals were isopropyl alcohol (used in 274 products), 2-butoxyethanol
(used in 126 products), and ethylene glycol (used in 119 products).
 Between 2005 and 2009, the oil and gas service companies used hydraulic fracturing
products containing 29 chemicals that are (1) known or possible human carcinogens, (2)
regulated under the Safe Drinking Water Act for their risks to human health, or (3) listed as
hazardous air pollutants under the Clean Air Act.  These 29 chemicals were components of more
than 650 different products used in hydraulic fracturing.2
The BTEX compounds – benzene, toluene, xylene, and ethylbenzene – appeared in 60 of
the hydraulic fracturing products used between 2005 and 2009.  Each BTEX compound is a
regulated contaminant under the Safe Drinking Water Act and a hazardous air pollutant under the
Clean Air Act.  Benzene also is a known human carcinogen.  The hydraulic fracturing companies
injected 11.4 million gallons of products containing at least one BTEX chemical over the five
year period.  
 
In many instances, the oil and gas service companies were unable to provide the
Committee with a complete chemical makeup of the hydraulic fracturing fluids they used.
Between 2005 and 2009, the companies used 94 million gallons of 279 products that contained at
least one chemical or component that the manufacturers deemed proprietary or a trade secret.
Committee staff requested that these companies disclose this proprietary information.  Although
some companies did provide information about these proprietary fluids, in most cases the
companies stated that they did not have access to proprietary information about products they
purchased “off the shelf” from chemical suppliers.  In these cases, the companies are injecting
fluids containing chemicals that they themselves cannot identify.
II. BACKGROUND
Hydraulic fracturing – a method by which oil and gas service companies provide access
to domestic energy trapped in hard-to-reach geologic formations — has been the subject of both
enthusiasm and increasing environmental and health concerns in recent years.  Hydraulic
fracturing, used in combination with horizontal drilling, has allowed industry to access natural
gas reserves previously considered uneconomical, particularly in shale formations.  As a result of
the growing use of hydraulic fracturing, natural gas production in the United States reached
21,577 billion cubic feet in 2010, a level not achieved since a period of high natural gas
production between 1970 and 1974.
1
  Overall, the Energy Information Administration now
projects that the United States possesses 2,552 trillion cubic feet of potential natural gas
resources, enough to supply the United States for approximately 110 years.  Natural gas from
shale resources accounts for 827 trillion cubic feet of this total, which is more than double what
the EIA estimated just a year ago.
2
Hydraulic fracturing creates access to more natural gas supplies, but the process requires
the use of large quantities of water and fracturing fluids, which are injected underground at high
volumes and pressure.  Oil and gas service companies design fracturing fluids to create fractures
and transport sand or other granular substances to prop open the fractures.  The composition of
these fluids varies by formation, ranging from a simple mixture of water and sand to more
complex mixtures with a multitude of chemical additives.  The companies may use these
                                               
1
 Energy Information Administration (EIA), Natural Gas Monthly (Mar. 2011), Table 1,
U.S. Natural Gas Monthly Supply and Disposition Balance (online at
www.eia.gov/dnav/ng/hist/n9070us1A.htm) (accessed Mar. 30, 2011).
2
 EIA, Annual Energy Outlook 2011 Early Release (Dec. 16, 2010); EIA, What is shale
gas and why is it important? (online at www.eia.doe.gov/energy_in_brief/about_shale_gas.cfm)
(accessed Mar. 30, 2011).  3
chemical additives to thicken or thin the fluids, improve the flow of the fluid, or kill bacteria that
can reduce fracturing performance.
3
 
Some of these chemicals, if not disposed of safely or allowed to leach into the drinking
water supply, could damage the environment or pose a risk to human health.  During hydraulic
fracturing, fluids containing chemicals are injected deep underground, where their migration is
not entirely predictable.  Well failures, such as the use of insufficient well casing, could lead to
their release at shallower depths, closer to drinking water supplies.
4
  Although some fracturing
fluids are removed from the well at the end of the fracturing process, a substantial amount
remains underground.
5
 
While most underground injections of chemicals are subject to the protections of the Safe
Drinking Water Act (SDWA), Congress in 2005 modified the law to exclude “the underground
injection of fluids or propping agents (other than diesel fuels) pursuant to hydraulic fracturing
operations related to oil, gas, or geothermal production activities” from the Act’s protections.
6
 
Unless oil and gas service companies use diesel in the hydraulic fracturing process, the
permanent underground injection of chemicals used for hydraulic fracturing is not regulated by
the Environmental Protection Agency (EPA).
Concerns also have been raised about the ultimate outcome of chemicals that are
recovered and disposed of as wastewater.  This wastewater is stored in tanks or pits at the well
site, where spills are possible.
7
   For final disposal, well operators must either recycle the fluids
for use in future fracturing jobs, inject it into underground storage wells (which, unlike the
fracturing process itself, are subject to the Safe Drinking Water Act), discharge it to nearby
surface water, or transport it to wastewater treatment facilities.
8
  A recent report in the New York
                                               
3
 U.S. Environmental Protection Agency, Evaluation of Impacts to Underground Sources
of Drinking Water by Hydraulic Fracturing of Coalbed Methane Reservoirs (June 2004) (EPA
816-R-04-003) at 4-1 and 4-2.
4
 For instance, Pennsylvania’s Department of Environmental Protection has cited Cabot
Oil & Gas Corporation for contamination of drinking water wells with seepage caused by weak
casing or improper cementing of a natural gas well.  See Officials in Three States Pin Water
Woes on Gas Drilling, ProPublica (Apr. 26, 2009) (online at
www.propublica.org/article/officials-in-three-states-pin-water-woes-on-gas-drilling-426)
(accessed Mar. 24, 2011).
5
 John A. Veil, Argonne National Laboratory, Water Management Technologies Used by
Marcellus Shale Gas Producers, prepared for the Department of Energy (July 2010), at 13
(hereinafter “Water Management Technologies”).
6
 42 U.S.C. § 300h(d).  Many dubbed this provision the “Halliburton loophole” because
of Halliburton’s ties to then-Vice President Cheney and its role as one of the largest providers of
hydraulic fracturing services.  See The Halliburton Loophole, New York Times (Nov. 9. 2009).
7
See EPA, Draft Hydraulic Fracturing Study Plan (Feb. 7, 2011), at 37; Regulation Lax
as Gas Wells’ Tainted Water Hits Rivers, New York Times (Feb. 26, 2011).
8
Water Management Technologies, at 13. 4
Times raised questions about the safety of surface water discharge and the ability of water
treatment facilities to process wastewater from natural gas drilling operations.
9
 
Any risk to the environment and human health posed by fracturing fluids depends in large
part on their contents.  Federal law, however, contains no public disclosure requirements for oil
and gas producers or service companies involved in hydraulic fracturing, and state disclosure
requirements vary greatly.
10
  While the industry has recently announced that it soon will create a
public database of fluid components, reporting to this database is strictly voluntary, disclosure
will not include the chemical identity of products labeled as proprietary, and there is no way to
determine if companies are accurately reporting information for all wells.
11
 
The absence of a minimum national baseline for disclosure of fluids injected during the
hydraulic fracturing process and the exemption of most hydraulic fracturing injections from
regulation under the Safe Drinking Water Act has left an informational void concerning the
contents, chemical concentrations, and volumes of fluids that go into the ground during
fracturing operations and return to the surface in the form of wastewater.  As a result, regulators
and the public are unable effectively to assess any impact the use of these fluids may have on the
environment or public health.  
III. METHODOLOGY
On February 18, 2010, the Committee commenced an investigation into the practice of
hydraulic fracturing and its potential impact on water quality across the United States.  This
investigation built on work begun by Ranking Member Henry A. Waxman in 2007 as Chairman
of the Committee on Oversight and Government Reform.  The Committee initially sent letters to
eight oil and gas service companies engaged in hydraulic fracturing in the United States.  In May
2010, the Committee sent letters to six additional oil and gas service companies to assess a
                                               
9
Regulation Lax as Gas Wells’ Tainted Water Hits Rivers, New York Times (Feb. 26,
2011).
10
 Wyoming, for example, recently enacted relatively strong disclosure regulations,
requiring disclosure on a well-by-well basis and “for each stage of the well stimulation
program,” “the chemical additives, compounds and concentrations or rates proposed to be mixed
and injected.”  See WCWR 055-000-003 Sec. 45.  Similar regulations became effective in
Arkansas this year.  See Arkansas Oil and Gas Commission Rule B-19.  In Wyoming, much of
this information is, after an initial period of review, available to the public.  See WCWR 055-
000-003 Sec. 21.  Other states, however, do not insist on such robust disclosure.  For instance,
West Virginia has no disclosure requirements for hydraulic fracturing and expressly exempts
fluids used during hydraulic fracturing from the disclosure requirements applicable to
underground injection of fluids for purposes of waste storage.  See W. Va. Code St. R. § 34-5-7.
11
See Ground Water Protection Council Calls for Disclosure of Chemicals Used in Shale
Gas Exploration, Ground Water Protection Council (Oct. 5, 2010) (online at
www.wqpmag.com/Ground-Water-Protection-Council-Calls-for-Disclosure-of-Chemicals-inShale-Gas-Exploration-newsPiece21700) (accessed Mar. 24, 2011). 5
broader range of industry practices.
12
  The February and May letters requested information on
the type and volume of chemicals present in the hydraulic fracturing products that each company
used in their fluids between 2005 and 2009.  
The 14 oil and gas service companies that received the letter voluntarily provided
substantial information to the Committee.  As requested, the companies reported the names and
volumes of the products they used during the five-year period.
13
  For each hydraulic fracturing
product reported, the companies also provided a Material Safety Data Sheet (MSDS) detailing
the product’s chemical components.  The Occupational Safety and Health Administration
(OSHA) requires chemical manufacturers to create a MSDS for every product they sell as a
means to communicate potential health and safety hazards to employees and employers.  The
MSDS must list all hazardous ingredients if they comprise at least 1% of the product; for
carcinogens, the reporting threshold is 0.1%.
14
 
Under OSHA regulations, manufacturers may withhold the identity of chemical
components that constitute “trade secrets.”
15
  If the MSDS for a particular product used by a
company subject to the Committee’s investigation reported that the identity of any chemical
component was a trade secret, the Committee asked the company that used that product to
provide the proprietary information, if available.  
IV. HYDRAULIC FRACTURING FLUIDS AND THEIR CONTENTS
Between 2005 and 2009, the 14 oil and gas service companies used more than 2,500
hydraulic fracturing products containing 750 chemicals and other components.
16
  Overall, these
companies used 780 million gallons of hydraulic fracturing products in their fluids between 2005
and 2009.  This volume does not include water that the companies added to the fluids at the well
site before injection.  The products are comprised of a wide range of chemicals.  Some are
seemingly harmless like sodium chloride (salt), gelatin, and citric acid.  Others could pose a
severe risk to human health or the environment.  
                                               
12
 The Committee sent letters to Basic Energy Services, BJ Services, Calfrac Well
Services, Complete Production Services, Frac Tech Services, Halliburton, Key Energy Services,
RPC, Sanjel Corporation, Schlumberger, Superior Well Services, Trican Well Service, Universal
Well Services, and Weatherford.  
13
 BJ Services, Halliburton, and Schlumberger already had provided the Oversight
Committee with data for 2005 through 2007.  For BJ Services, the 2005-2007 data is limited to
natural gas wells.  For Schlumberger, the 2005-2007 data is limited to coalbed methane wells.
14
 29 CFR 1910.1200(g)(2)(i)(C)(1).
15
 29 CFR 1910.1200.
16
 Each hydraulic fracturing “product” is a mixture of chemicals or other components
designed to achieve a certain performance goal, such as increasing the viscosity of water.  Some
oil and gas service companies create their own products; most purchase these products from
chemical vendors.  The service companies then mix these products together at the well site to
formulate the hydraulic fracturing fluids that they pump underground.   6
Some of the components were surprising.  One company told the Committee that it used
instant coffee as one of the components in a fluid designed to inhibit acid corrosion.  Two
companies reported using walnut hulls as part of a breaker—a product used to degrade the
fracturing fluid viscosity, which helps to enhance post-fracturing fluid recovery.  Another
company reported using carbohydrates as a breaker.  One company used tallow soap—soap
made from beef, sheep, or other animals—to reduce loss of fracturing fluid into the exposed
rock.  
Appendix A lists each of the 750 chemicals and other components used in the hydraulic
fracturing products injected underground between 2005 and 2009.  
A. Commonly Used Chemical Components
The most widely used chemical in hydraulic fracturing during this time period, as
measured by the number of products containing the chemical, was methanol.  Methanol is a
hazardous air pollutant and a candidate for regulation under the Safe Drinking Water Act.  It was
a component in 342 hydraulic fracturing products.  Some of the other most widely used
chemicals include isopropyl alcohol, which was used in 274 products, and ethylene glycol, which
was used in 119 products.  Crystalline silica (silicon dioxide) appeared in 207 products, generally
proppants used to hold open fractures.  Table 1 has a list of the most commonly used compounds
in hydraulic fracturing fluids.
Table 1.  Chemical Components Appearing Most Often in
Hydraulic Fracturing Products Used Between 2005 and 2009
Chemical Component
No. of
Products
Containing
Chemical
Methanol (Methyl alcohol) 342
Isopropanol (Isopropyl alcohol, Propan-2-ol) 274
Crystalline silica - quartz (SiO2) 207
Ethylene glycol monobutyl ether (2-butoxyethanol) 126
Ethylene glycol (1,2-ethanediol) 119
Hydrotreated light petroleum distillates 89
Sodium hydroxide (Caustic soda) 80 7
Hydraulic fracturing companies used 2-butoxyethanol (2-BE) as a foaming agent or
surfactant in 126 products.  According to EPA scientists, 2-BE is easily absorbed and rapidly
distributed in humans following inhalation, ingestion, or dermal exposure.  Studies have shown
that exposure to 2-BE can cause hemolysis (destruction of red blood cells) and damage to the
spleen, liver, and bone marrow.
17
  The hydraulic fracturing companies injected 21.9 million
gallons of products containing 2-BE between 2005 and 2009.  They used the highest volume of
products containing 2-BE in Texas, which accounted for more than half of the volume used.
EPA recently found this chemical in drinking water wells tested in Pavillion, Wyoming.
18
  Table
2 shows the use of 2-BE by state.
Table 2.  States with the Highest Volume of
Hydraulic Fracturing Fluids Containing
2-Butoxyethanol (2005-2009)
State
Fluid Volume
(gallons)
Texas 12,031,734
Oklahoma 2,186,613
New Mexico 1,871,501
Colorado 1,147,614
Louisiana 890,068
Pennsylvania 747,416
West Virginia 464,231
Utah 382,874
Montana 362,497
Arkansas 348,959
                                               
17
 EPA, Toxicological Review of Ethylene Glycol Monobutyl Ether (Mar. 2010) at 4.
18
 EPA, Fact Sheet:  January 2010 Sampling Results and Site Update, Pavillion,
Wyoming Groundwater Investigation (Aug. 2010) (online at
www.epa.gov/region8/superfund/wy/pavillion/PavillionWyomingFactSheet.pdf) (accessed Mar.
1, 2011). 8
B. Toxic Chemicals
The oil and gas service companies used hydraulic fracturing products containing 29
chemicals that are (1) known or possible human carcinogens, (2) regulated under the Safe
Drinking Water Act for their risks to human health, or (3) listed as hazardous air pollutants under
the Clean Air Act.  These 29 chemicals were components of 652 different products used in
hydraulic fracturing.  Table 3 lists these toxic chemicals and their frequency of use.
  Table 3.  Chemicals Components of Concern:  Carcinogens, SDWA-Regulated
Chemicals, and Hazardous Air Pollutants
Chemical Component Chemical Category
No. of
Products
Methanol (Methyl alcohol) HAP 342
Ethylene glycol (1,2-ethanediol) HAP 119
Diesel
19
Carcinogen, SDWA, HAP 51
Naphthalene Carcinogen, HAP 44
Xylene SDWA, HAP 44
Hydrogen chloride (Hydrochloric acid) HAP 42
Toluene SDWA, HAP 29
Ethylbenzene SDWA, HAP 28
Diethanolamine (2,2-iminodiethanol) HAP 14
Formaldehyde Carcinogen, HAP 12
Sulfuric acid Carcinogen 9
Thiourea Carcinogen 9
Benzyl chloride Carcinogen, HAP 8
Cumene HAP 6
Nitrilotriacetic acid Carcinogen 6
Dimethyl formamide HAP 5
Phenol HAP 5
Benzene Carcinogen, SDWA, HAP 3
Di (2-ethylhexyl) phthalate Carcinogen, SDWA, HAP 3
Acrylamide Carcinogen, SDWA, HAP 2
Hydrogen fluoride (Hydrofluoric acid) HAP 2
Phthalic anhydride HAP 2
Acetaldehyde Carcinogen, HAP 1
Acetophenone HAP 1
Copper SDWA 1
Ethylene oxide Carcinogen, HAP 1
Lead Carcinogen, SDWA, HAP 1
Propylene oxide Carcinogen, HAP 1
p-Xylene HAP 1
Number of Products Containing a Component of Concern  652
                                               
19
 According to EPA, diesel contains benzene, toluene, ethylbenzene, and xylenes.  See
EPA, Evaluation of Impacts to Underground Sources of Drinking Water by Hydraulic
Fracturing of Coalbed Methane Reservoirs (June 2004) (EPA 816-R-04-003) at 4-11. 9
1. Carcinogens
Between 2005 and 2009, the hydraulic fracturing companies used 95 products containing
13 different carcinogens.
20
  These included naphthalene (a possible human carcinogen), benzene
(a known human carcinogen), and acrylamide (a probable human carcinogen).  Overall, these
companies injected 10.2 million gallons of fracturing products containing at least one
carcinogen.  The companies used the highest volume of fluids containing one or more
carcinogens in Texas, Colorado, and Oklahoma.  Table 4 shows the use of these chemicals by
state.  
Table 4.  States with at Least 100,000
Gallons of Hydraulic Fracturing Fluids
Containing a Carcinogen (2005-2009)
State
Fluid Volume
(gallons)
Texas 3,877,273
Colorado 1,544,388
Oklahoma 1,098,746
Louisiana 777,945
Wyoming 759,898
North Dakota 557,519
New Mexico 511,186
Montana 394,873
Utah 382,338
2. Safe Drinking Water Act Chemicals
Under the Safe Drinking Water Act, EPA regulates 53 chemicals that may have an
adverse effect on human health and are known to or likely to occur in public drinking water
systems at levels of public health concern.  Between 2005 and 2009, the hydraulic fracturing
companies used 67 products containing at least one of eight SDWA-regulated chemicals.
Overall, they injected 11.7 million gallons of fracturing products containing at least one chemical
regulated under SDWA.  Most of these chemicals were injected in Texas.  Table 5 shows the use
of these chemicals by state.    
                                               
20
 For purposes of this report, a chemical is considered a “carcinogen” if it is on one of
two lists:  (1) substances identified by the National Toxicology Program as “known to be human
carcinogens” or as “reasonably anticipated to be human carcinogens”; and (2) substances
identified by the International Agency for Research on Cancer, part of the World Health
Organization, as “carcinogenic” or “probably carcinogenic” to humans.  See U.S. Department of
Health and Human Services, Public Health Service, National Toxicology Program, Report on
Carcinogens, Eleventh Edition (Jan. 31, 2005) and World Health Organization, International
Agency for Research on Cancer, Agents Classified by the IARC Monographs (online at
http://monographs.iarc.fr/ENG/Classification/index.php) (accessed Feb. 28, 2011). 10
The vast majority of these SDWA-regulated chemicals were the BTEX compounds –
benzene, toluene, xylene, and ethylbenzene.  The BTEX compounds appeared in 60 hydraulic
fracturing products used between 2005 and 2009 and were used in 11.4 million gallons of
hydraulic fracturing fluids.  The Department of Health and Human Services, the International
Agency for Research on Cancer, and EPA have determined that benzene is a human
carcinogen.
21
  Chronic exposure to toluene, ethylbenzene, or xylenes also can damage the central
nervous system, liver, and kidneys.
22
 
Table 5.  States with at Least 100,000 Gallons of
Hydraulic Fracturing Fluids Containing a SDWARegulated Chemical (2005-2009)
State
Fluid Volume
(gallons)
Texas 9,474,631
New Mexico 1,157,721
Colorado 375,817
Oklahoma 202,562
Mississippi 108,809
North Dakota 100,479
 In addition, the hydraulic fracturing companies injected more than 30 million gallons of
diesel fuel or hydraulic fracturing fluids containing diesel fuel in wells in 19 states.
23
  In a 2004
report, EPA stated that the “use of diesel fuel in fracturing fluids poses the greatest threat” to
underground sources of drinking water.
24
  Diesel fuel contains toxic constituents, including
BTEX compounds.
25
EPA also has created a Candidate Contaminant List (CCL), which is a list of
contaminants that are currently not subject to national primary drinking water regulations but are
known or anticipated to occur in public water systems and may require regulation under the Safe
Drinking Water Act in the future.
26
  Nine chemicals on that list—1-butanol, acetaldehyde, benzyl
                                               
21
 U.S. Department of Health and Human Services, Agency for Toxic Substances and
Disease Registry, Public Health Statement for Benzene (Aug. 2007).
22
 EPA, Basic Information about Toluene in Drinking Water, Basic Information about
Ethylbenzene in Drinking Water, and Basic Information about Xylenes in Drinking Water (online
at http://water.epa.gov/drink/contaminants/basicinformation/index.cfm) (accessed Oct. 14,
2010).
23
 Letter from Reps. Henry A. Waxman, Edward J. Markey, and Diana DeGette to the
Honorable Lisa Jackson, Administrator, U.S. Environmental Protection Agency (Jan. 31, 2011).
24
 EPA, Evaluation of Impacts to Underground Sources of Drinking Water by Hydraulic
Fracturing of Coalbed Methane Reservoirs (June 2004) (EPA 816-R-04-003) at 4-11.
25
Id.
26
 EPA, Contaminant Candidate List 3 (online at
http://water.epa.gov/scitech/drinkingwater/dws/ccl/ccl3.cfm) (accessed Mar. 31, 2011). 11
chloride, ethylene glycol, ethylene oxide, formaldehyde, methanol, n-methyl-2-pyrrolidone, and
propylene oxide—were used in hydraulic fracturing products between 2005 and 2009.  
3.   Hazardous Air Pollutants
The Clean Air Act requires EPA to control the emission of 187 hazardous air pollutants,
which are pollutants that cause or may cause cancer or other serious health effects, such as
reproductive effects or birth defects, or adverse environmental and ecological effects.
27
  Between
2005 and 2009, the hydraulic fracturing companies used 595 products containing 24 different
hazardous air pollutants.  
 Hydrogen fluoride is a hazardous air pollutant that is a highly corrosive and systemic
poison that causes severe and sometimes delayed health effects due to deep tissue penetration.
Absorption of substantial amounts of hydrogen fluoride by any route may be fatal.
28
  One of the
hydraulic fracturing companies used 67,222 gallons of two products containing hydrogen
fluoride in 2008 and 2009.
 Lead is a hazardous air pollutant that is a heavy metal that is particularly harmful to
children’s neurological development.  It also can cause health problems in adults, including
reproductive problems, high blood pressure, and nerve disorders.
29
  One of the hydraulic
fracturing companies used 780 gallons of a product containing lead in this five-year period.
Methanol is the hazardous air pollutant that appeared most often in hydraulic fracturing
products.  Other hazardous air pollutants used in hydraulic fracturing fluids included
formaldehyde, hydrogen chloride, and ethylene glycol.
V. USE OF PROPRIETARY AND “TRADE SECRET” CHEMICALS
Many chemical components of hydraulic fracturing fluids used by the companies were
listed on the MSDSs as “proprietary” or “trade secret.”  The hydraulic fracturing companies used
93.6 million gallons of 279 products containing at least one proprietary component between 2005
and 2009.
30
                                               
27
 Clean Air Act Section 112(b), 42 U.S.C. § 7412.
28
 HHS, Agency for Toxic Substances and Disease Registry, Medical Management
Guidelines for Hydrogen Fluoride (online at www.atsdr.cdc.gov/mhmi/mmg11.pdf) (accessed
Mar. 24, 2011).
29
 EPA, Basic Information about Lead (online at www.epa.gov/lead/pubs/leadinfo.htm)
(accessed Mar. 30, 2011).
30
 This is likely a conservative estimate.  We included only those products for which the
MSDS says “proprietary” or “trade secret” instead of listing a component by name or providing
the CAS number.  If the MSDS listed a component’s CAS as N.A. or left it blank, we did not
count that as a trade secret claim, unless the company specified as such in follow-up
correspondence. 12
The Committee requested that these companies disclose this proprietary information.
Although a few companies were able to provide additional information to the Committee about
some of the fracturing products, in most cases the companies stated that they did not have access
to proprietary information about products they purchased “off the shelf” from chemical
suppliers.  The proprietary information belongs to the suppliers, not the users of the chemicals.  
Universal Well Services, for example, told the Committee that it “obtains hydraulic
fracturing products from third-party manufacturers, and to the extent not publicly disclosed,
product composition is proprietary to the respective vendor and not to the Company.”
31
Complete Production Services noted that the company always uses fluids from third-party
suppliers who provide an MSDS for each product.  Complete confirmed that it is “not aware of
any circumstances in which the vendors who provided the products have disclosed this
proprietary information” to the company, further noting that “such information is highly
proprietary for these vendors, and would not generally be disclosed to service providers” like
Complete.
32
  Key Energy Services similarly stated that it “generally does not have access to the
trade secret information as a purchaser of the chemical(s).”
33
  Trican also told the Committee that
it has limited knowledge of “off the shelf” products purchased from a chemical distributor or
manufacturer, noting that “Trican does not have any information in its possession about the
components of such products beyond what the distributor of each product provided Trican in the
MSDS sheet.”
34
 
In these cases, it appears that the companies are injecting fluids containing unknown
chemicals about which they may have limited understanding of the potential risks posed to
human health and the environment.
VI. CONCLUSION
Hydraulic fracturing has opened access to vast domestic reserves of natural gas that could
provide an important stepping stone to a clean energy future.  Yet questions about the safety of
hydraulic fracturing persist, which are compounded by the secrecy surrounding the chemicals
used in hydraulic fracturing fluids.  This analysis is the most comprehensive national assessment
to date of the types and volumes of chemical used in the hydraulic fracturing process.  It shows
that between 2005 and 2009, the 14 leading hydraulic fracturing companies in the United States
used over 2,500 hydraulic fracturing products containing 750 compounds.  More than 650 of
these products contained chemicals that are known or possible human carcinogens, regulated
under the Safe Drinking Water Act, or listed as hazardous air pollutants.
                                               
31
 Letter from Reginald J. Brown to Henry A. Waxman, Chairman, Committee on Energy
and Commerce, and Edward J. Markey, Chairman, Subcommittee on Energy and Environment
(Apr. 16, 2010).
32
 Letter from Philip Perry to Henry A. Waxman, Chairman, Committee Energy and
Commerce, and Edward J. Markey, Chairman, Subcommittee on Energy and Environment (Aug.
6, 2010).
33
 E-mail from Peter Spivack to Committee Staff (Aug. 5, 2010).
34
 E-mail from Lee Blalack to Committee Staff (July 29, 2010). 13
Appendix A.  Chemical Components of Hydraulic Fracturing Products, 2005-2009
35
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
1-(1-naphthylmethyl)quinolinium chloride 65322-65-8 1
1,2,3-propanetricarboxylic acid, 2-hydroxy-, trisodium salt, dihydrate 6132-04-3 1
1,2,3-trimethylbenzene 526-73-8 1
1,2,4-trimethylbenzene 95-63-6 21
1,2-benzisothiazol-3 2634-33-5 1
1,2-dibromo-2,4-dicyanobutane 35691-65-7 1
1,2-ethanediaminium, N, N'-bis[2-[bis(2-hydroxyethyl)methylammonio]ethyl]-N,N'-
bis(2-hydroxyethyl)-N,N'-dimethyl-,tetrachloride 138879-94-4 2
1,3,5-trimethylbenzene 108-67-8 3
1,6-hexanediamine dihydrochloride 6055-52-3 1
1,8-diamino-3,6-dioxaoctane  929-59-9 1
1-hexanol  111-27-3 1
1-methoxy-2-propanol 107-98-2 3
2,2`-azobis (2-amidopropane) dihydrochloride 2997-92-4 1
2,2-dibromo-3-nitrilopropionamide 10222-01-2 27
2-acrylamido-2-methylpropanesulphonic acid sodium salt polymer * 1
2-bromo-2-nitropropane-1,3-diol 52-51-7 4
2-butanone oxime 96-29-7 1
2-hydroxypropionic acid 79-33-4 2
2-mercaptoethanol (Thioglycol) 60-24-2 13
2-methyl-4-isothiazolin-3-one 2682-20-4 4
2-monobromo-3-nitrilopropionamide 1113-55-9 1
2-phosphonobutane-1,2,4-tricarboxylic acid 37971-36-1 2
2-phosphonobutane-1,2,4-tricarboxylic acid, potassium salt 93858-78-7 1
2-substituted aromatic amine salt * 1
4,4'-diaminodiphenyl sulfone 80-08-0 3
5-chloro-2-methyl-4-isothiazolin-3-one 26172-55-4 5
Acetaldehyde  75-07-0 1
Acetic acid  64-19-7 56
Acetic anhydride 108-24-7 7
Acetone  67-64-1 3
Acetophenone  98-86-2 1
Acetylenic alcohol  * 1
Acetyltriethyl citrate 77-89-4 1
Acrylamide  79-06-1 2
Acrylamide copolymer * 1
Acrylamide copolymer 38193-60-1 1
                                               
35
 To compile this list of chemicals, Committee staff reviewed each Material Safety Data
Sheet provided to the Committee for hydraulic fracturing products used between 2005 and 2009.
Committee staff transcribed the names and CAS numbers as written in the MSDSs; as such, any
inaccuracies on this list reflect inaccuracies on the MSDSs themselves. 14
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Acrylate copolymer  * 1
Acrylic acid, 2-hydroxyethyl ester 818-61-1 1
Acrylic acid/2-acrylamido-methylpropylsulfonic acid copolymer 37350-42-8 1
Acrylic copolymer 403730-32-5 1
Acrylic polymers  * 1
Acrylic polymers 26006-22-4 2
Acyclic hydrocarbon blend * 1
Adipic acid  124-04-9 6
Alcohol alkoxylate  * 5
Alcohol ethoxylates  * 2
Alcohols  * 9
Alcohols, C11-15-secondary, ethoxylated 68131-40-8 1
Alcohols, C12-14-secondary 126950-60-5 4
Alcohols, C12-14-secondary, ethoxylated 84133-50-6 19
Alcohols, C12-15, ethoxylated  68131-39-5 2
Alcohols, C12-16, ethoxylated 103331-86-8 1
Alcohols, C12-16, ethoxylated 68551-12-2 3
Alcohols, C14-15, ethoxylated 68951-67-7 5
Alcohols, C9-11-iso-, C10-rich, ethoxylated 78330-20-8 4
Alcohols, C9-C22  * 1
Aldehyde  * 4
Aldol  107-89-1 1
Alfa-Alumina  * 5
Aliphatic acid  * 1
Aliphatic alcohol polyglycol ether 68015-67-8 1
Aliphatic amine derivative 120086-58-0 2
Alkaline bromide salts * 2
Alkanes, C10-14 93924-07-3 2
Alkanes, C13-16-iso 68551-20-2 2
Alkanolamine 150-25-4 3
Alkanolamine chelate of zirconium alkoxide (Zirconium complex) 197980-53-3 4
Alkanolamine/aldehyde condensate * 1
Alkenes  * 1
Alkenes, C>10 alpha- 64743-02-8 3
Alkenes, C>8 68411-00-7 2
Alkoxylated alcohols  * 1
Alkoxylated amines  * 6
Alkoxylated phenol formaldehyde resin 63428-92-2 1
Alkyaryl sulfonate  * 1
Alkyl (C12-16) dimethyl benzyl ammonium chloride 68424-85-1 7
Alkyl (C6-C12) alcohol, ethoxylated 68439-45-2 2
Alkyl (C9-11) alcohol, ethoxylated 68439-46-3 1
Alkyl alkoxylate  * 9
Alkyl amine  * 2 15
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Alkyl amine blend in a metal salt solution * 1
Alkyl aryl amine sulfonate 255043-08-04 1
Alkyl benzenesulfonic acid 68584-22-5 2
Alkyl esters  * 2
Alkyl hexanol  * 1
Alkyl ortho phosphate ester * 1
Alkyl phosphate ester  * 3
Alkyl quaternary ammonium chlorides * 4
Alkylaryl sulfonate  * 1
Alkylaryl sulphonic acid 27176-93-9 1
Alkylated quaternary chloride * 5
Alkylbenzenesulfonic acid * 1
Alkylethoammonium sulfates * 1
Alkylphenol ethoxylates * 1
Almandite and pyrope garnet 1302-62-1 1
Aluminium isopropoxide 555-31-7 1
Aluminum  7429-90-5 2
Aluminum chloride  * 3
Aluminum chloride 1327-41-9 2
Aluminum oxide (alpha-Alumina) 1344-28-1 24
Aluminum oxide silicate 12068-56-3 1
Aluminum silicate (mullite) 1302-76-7 38
Aluminum sulfate hydrate 10043-01-3 1
Amides, tallow, n-[3-(dimethylamino)propyl],n-oxides 68647-77-8 4
Amidoamine  * 1
Amine  * 7
Amine bisulfite 13427-63-9 1
Amine oxides  * 1
Amine phosphonate  * 3
Amine salt  * 2
Amines, C14-18; C16-18-unsaturated, alkyl, ethoxylated 68155-39-5 1
Amines, coco alkyl, acetate 61790-57-6 3
Amines, polyethylenepoly-, ethoxylated, phosphonomethylated 68966-36-9 1
Amines, tallow alkyl, ethoxylated 61791-26-2 2
Amino compounds  * 1
Amino methylene phosphonic acid salt * 1
Amino trimethylene phosphonic acid 6419-19-8 2
Ammonia  7664-41-7 7
Ammonium acetate 631-61-8 4
Ammonium alcohol ether sulfate 68037-05-8 1
Ammonium bicarbonate 1066-33-7 1
Ammonium bifluoride (Ammonium hydrogen difluoride) 1341-49-7 10
Ammonium bisulfate 7783-20-2 3
Ammonium bisulfite 10192-30-0 15 16
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Ammonium C6-C10 alcohol ethoxysulfate 68187-17-7 4
Ammonium C8-C10 alkyl ether sulfate 68891-29-2 4
Ammonium chloride 12125-02-9 29
Ammonium fluoride 12125-01-8 9
Ammonium hydroxide 1336-21-6 4
Ammonium nitrate 6484-52-2 2
Ammonium persulfate (Diammonium peroxidisulfate) 7727-54-0 37
Ammonium salt  * 1
Ammonium salt of ethoxylated alcohol sulfate * 1
Amorphous silica 99439-28-8 1
Amphoteric alkyl amine 61789-39-7 1
Anionic copolymer  * 3
Anionic polyacrylamide * 1
Anionic polyacrylamide 25085-02-3 6
Anionic polyacrylamide copolymer * 3
Anionic polymer  * 2
Anionic polymer in solution * 1
Anionic polymer, sodium salt 9003-04-7 1
Anionic water-soluble polymer * 2
Antifoulant  * 1
Antimonate salt  * 1
Antimony pentoxide 1314-60-9 2
Antimony potassium oxide 29638-69-5 4
Antimony trichloride 10025-91-9 2
a-organic surfactants 61790-29-8 1
Aromatic alcohol glycol ether * 2
Aromatic aldehyde  * 2
Aromatic ketones 224635-63-6 2
Aromatic polyglycol ether * 1
Barium sulfate 7727-43-7 3
Bauxite  1318-16-7 16
Bentonite  1302-78-9 2
Benzene  71-43-2 3
Benzene, C10-16, alkyl derivatives 68648-87-3 1
Benzenecarboperoxoic acid, 1,1-dimethylethyl ester 614-45-9 1
Benzenemethanaminium 3844-45-9 1
Benzenesulfonic acid, C10-16-alkyl derivs., potassium salts 68584-27-0 1
Benzoic acid  65-85-0 11
Benzyl chloride 100-44-7 8
Biocide component  * 3
Bis(1-methylethyl)naphthalenesulfonic acid, cyclohexylamine salt 68425-61-6 1
Bishexamethylenetriamine penta methylene phosphonic acid 35657-77-3 1
Bisphenol A/Epichlorohydrin resin 25068-38-6 5
Bisphenol A/Novolac epoxy resin 28906-96-9 1 17
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Borate  12280-03-4 2
Borate salts  * 5
Boric acid  10043-35-3 18
Boric acid, potassium salt 20786-60-1 1
Boric acid, sodium salt 1333-73-9 2
Boric oxide  1303-86-2 1
b-tricalcium phosphate 7758-87-4 1
Butanedioic acid 2373-38-8 4
Butanol  71-36-3 3
Butyl glycidyl ether 2426-08-6 5
Butyl lactate  138-22-7 4
C10-C16 ethoxylated alcohol 68002-97-1 4
C-11 to C-14 n-alkanes, mixed * 1
C12-C14 alcohol, ethoxylated 68439-50-9 3
Calcium carbonate 471-34-1 1
Calcium carbonate (Limestone) 1317-65-3 9
Calcium chloride 10043-52-4 17
Calcium chloride, dihydrate 10035-04-8 1
Calcium fluoride 7789-75-5 2
Calcium hydroxide 1305-62-0 9
Calcium hypochlorite 7778-54-3 1
Calcium oxide 1305-78-8 6
Calcium peroxide 1305-79-9 5
Carbohydrates  * 3
Carbon dioxide 124-38-9 4
Carboxymethyl guar gum, sodium salt 39346-76-4 7
Carboxymethyl hydroxypropyl guar 68130-15-4 11
Cellophane  9005-81-6 2
Cellulase  9012-54-8 7
Cellulase enzyme  * 1
Cellulose  9004-34-6 1
Cellulose derivative  * 2
Chloromethylnaphthalene quinoline quaternary amine 15619-48-4 3
Chlorous ion solution  * 2
Choline chloride 67-48-1 3
Chromates  * 1
Chromium (iii) acetate 1066-30-4 1
Cinnamaldehyde (3-phenyl-2-propenal) 104-55-2 5
Citric acid (2-hydroxy-1,2,3 propanetricarboxylic acid) 77-92-9 29
Citrus terpenes 94266-47-4 11
Coal, granular 50815-10-6 1
Cobalt acetate  71-48-7 1
Cocaidopropyl betaine 61789-40-0 2
Cocamidopropylamine oxide 68155-09-9 1 18
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Coco bis-(2-hydroxyethyl) amine oxide 61791-47-7 1
Cocoamidopropyl betaine 70851-07-9 1
Cocomidopropyl dimethylamine 68140-01-2 1
Coconut fatty acid diethanolamide 68603-42-9 1
Collagen (Gelatin) 9000-70-8 6
Complex alkylaryl polyo-ester * 1
Complex aluminum salt * 2
Complex organometallic salt * 2
Complex substituted keto-amine 143106-84-7 1
Complex substituted keto-amine hydrochloride * 1
Copolymer of acrylamide and sodium acrylate 25987-30-8 1
Copper  7440-50-8 1
Copper iodide 7681-65-4 1
Copper sulfate 7758-98-7 3
Corundum (Aluminum oxide) 1302-74-5 48
Crotonaldehyde 123-73-9 1
Crystalline silica - cristobalite 14464-46-1 44
Crystalline silica - quartz (SiO2) 14808-60-7 207
Crystalline silica, tridymite 15468-32-3 2
Cumene  98-82-8 6
Cupric chloride 7447-39-4 10
Cupric chloride dihydrate 10125-13-0 7
Cuprous chloride 7758-89-6 1
Cured acrylic resin  * 7
Cured resin  * 4
Cured silicone rubber-polydimethylsiloxane 63148-62-9 1
Cured urethane resin  * 3
Cyclic alkanes  * 1
Cyclohexane  110-82-7 1
Cyclohexanone 108-94-1 1
Decanol  112-30-1 2
Decyl-dimethyl amine oxide 2605-79-0 4
Dextrose monohydrate 50-99-7 1
D-Glucitol  50-70-4 1
Di (2-ethylhexyl) phthalate 117-81-7 3
Di (ethylene glycol) ethyl ether acetate 112-15-2 4
Diatomaceous earth 61790-53-2 3
Diatomaceous earth, calcined 91053-39-3 7
Dibromoacetonitrile 3252-43-5 1
Dibutylaminoethanol (2-dibutylaminoethanol) 102-81-8 4
Di-calcium silicate 10034-77-2 1
Dicarboxylic acid  * 1
Didecyl dimethyl ammonium chloride 7173-51-5 1
Diesel  * 1 19
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Diesel  68334-30-5 3
Diesel  68476-30-2 4
Diesel  68476-34-6 43
Diethanolamine (2,2-iminodiethanol) 111-42-2 14
Diethylbenzene 25340-17-4 1
Diethylene glycol 111-46-6 8
Diethylene glycol monomethyl ether 111-77-3 4
Diethylene triaminepenta (methylene phosphonic acid) 15827-60-8 1
Diethylenetriamine 111-40-0 2
Diethylenetriamine, tall oil fatty acids reaction product  61790-69-0 1
Diisopropylnaphthalenesulfonic acid 28757-00-8 2
Dimethyl formamide 68-12-2 5
Dimethyl glutarate 1119-40-0 1
Dimethyl silicone  * 2
Dioctyl sodium sulfosuccinate 577-11-7 1
Dipropylene glycol 25265-71-8 1
Dipropylene glycol monomethyl ether (2-methoxymethylethoxy propanol) 34590-94-8 12
Di-secondary-butylphenol 53964-94-6 3
Disodium EDTA 139-33-3 1
Disodium ethylenediaminediacetate 38011-25-5 1
Disodium ethylenediaminetetraacetate dihydrate 6381-92-6 1
Disodium octaborate tetrahydrate 12008-41-2 1
Dispersing agent  * 1
d-Limonene  5989-27-5 11
Dodecyl alcohol ammonium sulfate 32612-48-9 2
Dodecylbenzene sulfonic acid 27176-87-0 14
Dodecylbenzene sulfonic acid salts 42615-29-2 2
Dodecylbenzene sulfonic acid salts 68648-81-7 7
Dodecylbenzene sulfonic acid salts 90218-35-2 1
Dodecylbenzenesulfonate isopropanolamine 42504-46-1 1
Dodecylbenzenesulfonic acid, monoethanolamine salt 26836-07-7 1
Dodecylbenzenesulphonic acid, morpholine salt 12068-08-5 1
EDTA/Copper chelate * 2
EO-C7-9-iso-, C8-rich alcohols 78330-19-5 5
Epichlorohydrin 25085-99-8 5
Epoxy resin  * 5
Erucic amidopropyl dimethyl betaine 149879-98-1 3
Erythorbic acid 89-65-6 2
Essential oils  * 6
Ethanaminium, n,n,n-trimethyl-2-[(1-oxo-2-propenyl)oxy]-,chloride, polymer with
2-propenamide 69418-26-4 4
Ethanol (Ethyl alcohol) 64-17-5 36
Ethanol, 2-(hydroxymethylamino)- 34375-28-5 1
Ethanol, 2, 2'-(Octadecylamino) bis- 10213-78-2 1 20
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Ethanoldiglycine disodium salt 135-37-5 1
Ether salt  25446-78-0 2
Ethoxylated 4-nonylphenol (Nonyl phenol ethoxylate) 26027-38-3 9
Ethoxylated alcohol 104780-82-7 1
Ethoxylated alcohol 78330-21-9 2
Ethoxylated alcohols  * 3
Ethoxylated alkyl amines * 1
Ethoxylated amine  * 1
Ethoxylated amines 61791-44-4 1
Ethoxylated fatty acid ester * 1
Ethoxylated nonionic surfactant * 1
Ethoxylated nonyl phenol * 8
Ethoxylated nonyl phenol 68412-54-4 10
Ethoxylated nonyl phenol 9016-45-9 38
Ethoxylated octyl phenol 68987-90-6 1
Ethoxylated octyl phenol 9002-93-1 1
Ethoxylated octyl phenol 9036-19-5 3
Ethoxylated oleyl amine 13127-82-7 2
Ethoxylated oleyl amine 26635-93-8 1
Ethoxylated sorbitol esters * 1
Ethoxylated tridecyl alcohol phosphate 9046-01-9 2
Ethoxylated undecyl alcohol 127036-24-2 2
Ethyl acetate  141-78-6 4
Ethyl acetoacetate 141-97-9 1
Ethyl octynol (1-octyn-3-ol,4-ethyl-) 5877-42-9 5
Ethylbenzene  100-41-4 28
Ethylene glycol (1,2-ethanediol) 107-21-1 119
Ethylene glycol monobutyl ether (2-butoxyethanol) 111-76-2 126
Ethylene oxide  75-21-8 1
Ethylene oxide-nonylphenol polymer * 1
Ethylenediaminetetraacetic acid 60-00-4 1
Ethylene-vinyl acetate copolymer 24937-78-8 1
Ethylhexanol (2-ethylhexanol) 104-76-7 18
Fatty acid ester  * 1
Fatty acid, tall oil, hexa esters with sorbitol, ethoxylated 61790-90-7 1
Fatty acids  * 1
Fatty alcohol alkoxylate * 1
Fatty alkyl amine salt  * 1
Fatty amine carboxylates * 1
Fatty quaternary ammonium chloride  61789-68-2 1
Ferric chloride 7705-08-0 3
Ferric sulfate 10028-22-5 7
Ferrous sulfate, heptahydrate 7782-63-0 4
Fluoroaliphatic polymeric esters * 1 21
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Formaldehyde  50-00-0 12
Formaldehyde polymer *  2
Formaldehyde, polymer with 4-(1,1-dimethyl)phenol, methyloxirane and oxirane 30704-64-4 3
Formaldehyde, polymer with 4-nonylphenol and oxirane 30846-35-6 1
Formaldehyde, polymer with ammonia and phenol 35297-54-2 2
Formamide  75-12-7 5
Formic acid  64-18-6 24
Fumaric acid  110-17-8 8
Furfural  98-01-1 1
Furfuryl alcohol 98-00-0 3
Glass fiber  65997-17-3 3
Gluconic acid  526-95-4 1
Glutaraldehyde 111-30-8 20
Glycerol (1,2,3-Propanetriol, Glycerine) 56-81-5 16
Glycol ethers  * 9
Glycol ethers 9004-77-7 4
Glyoxal  107-22-2 3
Glyoxylic acid 298-12-4 1
Guar gum  9000-30-0 41
Guar gum derivative  * 12
Haloalkyl heteropolycycle salt * 6
Heavy aromatic distillate 68132-00-3 1
Heavy aromatic petroleum naphtha 64742-94-5 45
Heavy catalytic reformed petroleum naphtha 64741-68-0 10
Hematite  * 5
Hemicellulase 9025-56-3 2
Hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine (Triazine) 4719-04-4 4
Hexamethylenetetramine 100-97-0 37
Hexanediamine 124-09-4 1
Hexanes  * 1
Hexylene glycol  107-41-5 5
Hydrated aluminum silicate 1332-58-7 4
Hydrocarbon mixtures 8002-05-9 1
Hydrocarbons  * 3
Hydrodesulfurized kerosine (petroleum) 64742-81-0 3
Hydrodesulfurized light catalytic cracked distillate (petroleum) 68333-25-5 1
Hydrodesulfurized middle distillate (petroleum) 64742-80-9 1
Hydrogen chloride (Hydrochloric acid) 7647-01-0 42
Hydrogen fluoride (Hydrofluoric acid) 7664-39-3 2
Hydrogen peroxide 7722-84-1 4
Hydrogen sulfide 7783-06-4 1
Hydrotreated and hydrocracked base oil * 2
Hydrotreated heavy naphthenic distillate 64742-52-5 3
Hydrotreated heavy paraffinic petroleum distillates 64742-54-7 1 22
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Hydrotreated heavy petroleum naphtha 64742-48-9 7
Hydrotreated light petroleum distillates 64742-47-8 89
Hydrotreated middle petroleum distillates 64742-46-7 3
Hydroxyacetic acid (Glycolic acid) 79-14-1 6
Hydroxyethylcellulose 9004-62-0 1
Hydroxyethylethylenediaminetriacetic acid, trisodium salt  139-89-9 1
Hydroxylamine hydrochloride 5470-11-1 1
Hydroxypropyl guar gum 39421-75-5 2
Hydroxysultaine  * 1
Inner salt of alkyl amines * 2
Inorganic borate  * 3
Inorganic particulate  * 1
Inorganic salt  * 1
Inorganic salt  533-96-0 1
Inorganic salt 7446-70-0 1
Instant coffee purchased off the shelf * 1
Inulin, carboxymethyl ether, sodium salt  430439-54-6 1
Iron oxide  1332-37-2 2
Iron oxide (Ferric oxide) 1309-37-1 18
Iso amyl alcohol 123-51-3 1
Iso-alkanes/n-alkanes  * 10
Isobutanol (Isobutyl alcohol) 78-83-1 4
Isomeric aromatic ammonium salt * 1
Isooctanol  26952-21-6 1
Isooctyl alcohol 68526-88-0 1
Isooctyl alcohol bottoms 68526-88-5 1
Isopropanol (Isopropyl alcohol, Propan-2-ol) 67-63-0 274
Isopropylamine 75-31-0 1
Isotridecanol, ethoxylated 9043-30-5 1
Kerosene  8008-20-6 13
Lactic acid  10326-41-7 1
Lactic acid  50-21-5 1
L-Dilactide  4511-42-6 1
Lead  7439-92-1 1
Light aromatic solvent naphtha 64742-95-6 11
Light catalytic cracked petroleum distillates 64741-59-9 1
Light naphtha distillate, hydrotreated 64742-53-6 1
Low toxicity base oils * 1
Maghemite  * 2
Magnesium carbonate 546-93-0 1
Magnesium chloride 7786-30-3 4
Magnesium hydroxide 1309-42-8 4
Magnesium iron silicate 1317-71-1 3
Magnesium nitrate 10377-60-3 5 23
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Magnesium oxide 1309-48-4 18
Magnesium peroxide 1335-26-8 2
Magnesium peroxide 14452-57-4 4
Magnesium phosphide 12057-74-8 1
Magnesium silicate 1343-88-0 3
Magnesium silicate hydrate (talc) 14807-96-6 2
Magnetite  * 3
Medium aliphatic solvent petroleum naphtha 64742-88-7 10
Metal salt  * 2
Metal salt solution  * 1
Methanol (Methyl alcohol) 67-56-1 342
Methyl isobutyl carbinol (Methyl amyl alcohol) 108-11-2 3
Methyl salicylate 119-36-8 6
Methyl vinyl ketone 78-94-4 2
Methylcyclohexane 108-87-2 1
Mica  12001-26-2 3
Microcrystalline silica 1317-95-9 1
Mineral  * 1
Mineral Filler  * 1
Mineral spirits (stoddard solvent) 8052-41-3 2
Mixed titanium ortho ester complexes * 1
Modified alkane  * 1
Modified cycloaliphatic amine adduct * 3
Modified lignosulfonate * 1
Monoethanolamine (Ethanolamine) 141-43-5 17
Monoethanolamine borate 26038-87-9 1
Morpholine  110-91-8 2
Mullite  1302-93-8 55
n,n-dibutylthiourea 109-46-6 1
N,N-dimethyl-1-octadecanamine-HCl * 1
N,N-dimethyloctadecylamine 124-28-7 3
N,N-dimethyloctadecylamine hydrochloride 1613-17-8 2
n,n'-Methylenebisacrylamide 110-26-9 1
n-alkyl dimethyl benzyl ammonium chloride 139-08-2 1
Naphthalene  91-20-3 44
Naphthalene derivatives * 1
Naphthalenesulphonic acid, bis (1-methylethyl)-methyl derivatives 99811-86-6 1
Natural asphalt 12002-43-6 1
n-cocoamidopropyl-n,n-dimethyl-n-2-hydroxypropylsulfobetaine 68139-30-0 1
n-dodecyl-2-pyrrolidone 2687-96-9 1
N-heptane  142-82-5 1
Nickel sulfate hexahydrate 10101-97-0 2
Nitrilotriacetamide 4862-18-4 4
Nitrilotriacetic acid 139-13-9 6 24
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Nitrilotriacetonitrile 7327-60-8 3
Nitrogen  7727-37-9 9
n-Methylpyrrolidone 872-50-4 1
Nonane, all isomers  * 1
Non-hazardous salt  * 1
Nonionic surfactant  * 1
Nonyl phenol ethoxylate * 2
Nonyl phenol ethoxylate 9016-45-6 2
Nonyl phenol ethoxylate 9018-45-9 1
Nonylphenol   25154-52-3 1
Nonylphenol, ethoxylated and sulfated 9081-17-8 1
N-propyl zirconate  * 1
N-tallowalkyltrimethylenediamines * 1
Nuisance particulates  * 2
Nylon fibers 25038-54-4 2
Octanol  111-87-5 2
Octyltrimethylammonium bromide 57-09-0 1
Olefinic sulfonate  * 1
Olefins  * 1
Organic acid salt  * 3
Organic acids  * 1
Organic phosphonate  * 1
Organic phosphonate salts * 1
Organic phosphonic acid salts * 6
Organic salt  * 1
Organic sulfur compound * 2
Organic titanate  * 2
Organiophilic clay  * 2
Organo-metallic ammonium complex * 1
Other inorganic compounds * 1
Oxirane, methyl-, polymer with oxirane, mono-C10-16-alkyl ethers, phosphates 68649-29-6 1
Oxyalkylated alcohol  * 6
Oxyalkylated alcohols 228414-35-5 1
Oxyalkylated alkyl alcohol * 1
Oxyalkylated alkylphenol * 1
Oxyalkylated fatty acid * 2
Oxyalkylated phenol  * 1
Oxyalkylated polyamine * 1
Oxylated alcohol  * 1
Paraffin wax  8002-74-2 1
Paraffinic naphthenic solvent * 1
Paraffinic solvent  * 5
Paraffins  * 1
Perlite  93763-70-3 1 25
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Petroleum distillates  * 26
Petroleum distillates 64742-65-0 1
Petroleum distillates 64742-97-5 1
Petroleum distillates 68477-31-6 3
Petroleum gas oils  * 1
Petroleum gas oils 64741-43-1 1
Phenol  108-95-2 5
Phenol-formaldehyde resin 9003-35-4 32
Phosphate ester  * 6
Phosphate esters of alkyl phenyl ethoxylate 68412-53-3 1
Phosphine  * 1
Phosphonic acid  * 1
Phosphonic acid 129828-36-0 1
Phosphonic acid 13598-36-2 3
Phosphonic acid (dimethlamino(methylene)) 29712-30-9 1
Phosphonic acid, [nitrilotris(methylene)]tris-, pentasodium salt 2235-43-0 1
Phosphoric acid 7664-38-2 7
Phosphoric acid ammonium salt * 1
Phosphoric acid, mixed decyl, octyl and ethyl esters 68412-60-2 3
Phosphorous acid 10294-56-1 1
Phthalic anhydride 85-44-9 2
Pine oil  8002-09-3 5
Plasticizer  * 1
Poly(oxy-1,2-ethanediyl) 24938-91-8 1
Poly(oxy-1,2-ethanediyl), alpha-(4-nonylphenyl)-omega-hydroxy-, branched
(Nonylphenol ethoxylate) 127087-87-0 3
Poly(oxy-1,2-ethanediyl), alpha-hydro-omega-hydroxy 65545-80-4 1
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-(hexyloxy)-, ammonium salt 63428-86-4 3
Poly(oxy-1,2-ethanediyl),a-(nonylphenyl)-w-hydroxy-, phosphate 51811-79-1 1
Poly-(oxy-1,2-ethanediyl)-alpha-undecyl-omega-hydroxy 34398-01-1 6
Poly(sodium-p-styrenesulfonate) 25704-18-1 1
Poly(vinyl alcohol) 25213-24-5 2
Polyacrylamides 9003-05-8 2
Polyacrylamides  * 1
Polyacrylate  * 1
Polyamine  * 2
Polyanionic cellulose  * 2
Polyepichlorohydrin, trimethylamine quaternized 51838-31-4 1
Polyetheramine 9046-10-0 3
Polyether-modified trisiloxane 27306-78-1 1
Polyethylene glycol 25322-68-3 20
Polyethylene glycol ester with tall oil fatty acid 9005-02-1 1
Polyethylene polyammonium salt 68603-67-8 2
Polyethylene-polypropylene glycol 9003-11-6 5 26
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Polylactide resin  * 3
Polyoxyalkylenes  * 1
Polyoxyethylene castor oil  61791-12-6 1
Polyphosphoric acid, esters with triethanolamine, sodium salts 68131-72-6 1
Polypropylene glycol 25322-69-4 1
Polysaccharide  * 20
Polyvinyl alcohol  * 1
Polyvinyl alcohol 9002-89-5 2
Polyvinyl alcohol/polyvinylacetate copolymer * 1
Potassium acetate 127-08-2 1
Potassium carbonate 584-08-7 12
Potassium chloride 7447-40-7 29
Potassium formate 590-29-4 3
Potassium hydroxide 1310-58-3 25
Potassium iodide 7681-11-0 6
Potassium metaborate 13709-94-9 3
Potassium metaborate 16481-66-6 3
Potassium oxide 12136-45-7 1
Potassium pentaborate * 1
Potassium persulfate 7727-21-1 9
Propanol (Propyl alcohol) 71-23-8 18
Propanol, [2(2-methoxy-methylethoxy) methylethoxyl] 20324-33-8 1
Propargyl alcohol (2-propyn-1-ol) 107-19-7 46
Propylene carbonate (1,3-dioxolan-2-one, methyl-) 108-32-7 2
Propylene glycol (1,2-propanediol) 57-55-6 18
Propylene oxide 75-56-9 1
Propylene pentamer 15220-87-8 1
p-Xylene  106-42-3 1
Pyridinium, 1-(phenylmethyl)-, ethyl methyl derivatives, chlorides 68909-18-2 9
Pyrogenic silica 112945-52-5 3
Quaternary amine compounds * 3
Quaternary amine compounds 61789-18-2  1
Quaternary ammonium compounds * 9
Quaternary ammonium compounds 19277-88-4 1
Quaternary ammonium compounds 68989-00-4 1
Quaternary ammonium compounds 8030-78-2 1
Quaternary ammonium compounds, dicoco alkyldimethyl, chlorides 61789-77-3 2
Quaternary ammonium salts * 2
Quaternary compound * 1
Quaternary salt  * 2
Quaternized alkyl nitrogenated compound 68391-11-7 2
Rafinnates (petroleum), sorption process 64741-85-1 2
Residues (petroleum), catalytic reformer fractionator 64741-67-9 10
Resin  8050-09-7 2 27
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Rutile  1317-80-2 2
Salt of phosphate ester * 3
Salt of phosphono-methylated diamine * 1
Salts of oxyalkylated fatty amines 68551-33-7 1
Secondary alcohol  * 7
Silica (Silicon dioxide) 7631-86-9 47
Silica, amorphous  * 3
Silica, amorphous precipitated 67762-90-7 1
Silicon carboxylate 681-84-5 1
Silicon dioxide (Fused silica) 60676-86-0 7
Silicone emulsion  *  1
Sodium (C14-16) olefin sulfonate 68439-57-6 4
Sodium 2-ethylhexyl sulfate 126-92-1 1
Sodium acetate 127-09-3 6
Sodium acid pyrophosphate 7758-16-9 5
Sodium alkyl diphenyl oxide sulfonate 28519-02-0 1
Sodium aluminate 1302-42-7 1
Sodium aluminum phosphate 7785-88-8 1
Sodium bicarbonate (Sodium hydrogen carbonate) 144-55-8 10
Sodium bisulfite 7631-90-5 6
Sodium bromate 7789-38-0 10
Sodium bromide 7647-15-6 1
Sodium carbonate 497-19-8 14
Sodium chlorate 7775-09-9 1
Sodium chloride 7647-14-5 48
Sodium chlorite 7758-19-2 8
Sodium cocaminopropionate 68608-68-4 2
Sodium diacetate 126-96-5 2
Sodium erythorbate 6381-77-7 4
Sodium glycolate 2836-32-0 2
Sodium hydroxide (Caustic soda) 1310-73-2 80
Sodium hypochlorite 7681-52-9 14
Sodium lauryl-ether sulfate 68891-38-3 3
Sodium metabisulfite 7681-57-4 1
Sodium metaborate 7775-19-1 2
Sodium metaborate tetrahydrate 35585-58-1 6
Sodium metasilicate, anhydrous 6834-92-0 2
Sodium nitrite 7632-00-0 1
Sodium oxide (Na2O) 1313-59-3 1
Sodium perborate 1113-47-9 1
Sodium perborate  7632-04-4 1
Sodium perborate tetrahydrate 10486-00-7 4
Sodium persulfate 7775-27-1 6
Sodium phosphate  * 2 28
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Sodium polyphosphate 68915-31-1 1
Sodium salicylate 54-21-7 1
Sodium silicate 1344-09-8 2
Sodium sulfate 7757-82-6 7
Sodium tetraborate 1330-43-4 7
Sodium tetraborate decahydrate 1303-96-4 10
Sodium thiosulfate 7772-98-7 10
Sodium thiosulfate pentahydrate 10102-17-7 3
Sodium trichloroacetate 650-51-1 1
Sodium tripolyphosphate 7758-29-4 2
Sodium xylene sulfonate 1300-72-7 3
Sodium zirconium lactate 174206-15-6 1
Solvent refined heavy naphthenic petroleum distillates 64741-96-4 1
Sorbitan monooleate 1338-43-8 1
Stabilized aqueous chlorine dioxide 10049-04-4 1
Stannous chloride 7772-99-8 1
Stannous chloride dihydrate 10025-69-1 6
Starch  9005-25-8 5
Steam cracked distillate, cyclodiene dimer, dicyclopentadiene polymer 68131-87-3 1
Steam-cracked petroleum distillates 64742-91-2 6
Straight run middle petroleum distillates 64741-44-2 5
Substituted alcohol  * 2
Substituted alkene  * 1
Substituted alkylamine * 2
Sucrose  57-50-1 1
Sulfamic acid 5329-14-6 6
Sulfate  * 1
Sulfonate acids  * 1
Sulfonate surfactants  * 1
Sulfonic acid salts  * 1
Sulfonic acids, petroleum 61789-85-3 1
Sulfur compound  * 1
Sulfuric acid  7664-93-9 9
Sulfuric acid, monodecyl ester, sodium salt 142-87-0 2
Sulfuric acid, monooctyl ester, sodium salt 142-31-4 2
Surfactants  * 13
Sweetened middle distillate 64741-86-2 1
Synthetic organic polymer 9051-89-2 2
Tall oil (Fatty acids) 61790-12-3 4
Tall oil, compound with diethanolamine 68092-28-4 1
Tallow soap  * 2
Tar bases, quinoline derivatives, benzyl chloride-quaternized 72480-70-7 5
Tergitol  68439-51-0 1
Terpene hydrocarbon byproducts 68956-56-9 3 29
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Terpenes  * 1
Terpenes and terpenoids, sweet orange-oil 68647-72-3 2
Terpineol  8000-41-7 1
Tert-butyl hydroperoxide 75-91-2 6
Tetra-calcium-alumino-ferrite 12068-35-8 1
Tetraethylene glycol 112-60-7 1
Tetraethylenepentamine 112-57-2 2
Tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione (Dazomet) 533-74-4 13
Tetrakis (hydroxymethyl) phosphonium sulfate 55566-30-8 12
Tetramethyl ammonium chloride 75-57-0 14
Tetrasodium 1-hydroxyethylidene-1,1-diphosphonic acid 3794-83-0 1
Tetrasodium ethylenediaminetetraacetate 64-02-8 10
Thiocyanate sodium 540-72-7 1
Thioglycolic acid 68-11-1 6
Thiourea  62-56-6 9
Thiourea polymer 68527-49-1 3
Titanium complex  * 1
Titanium oxide 13463-67-7 19
Titanium, isopropoxy (triethanolaminate) 74665-17-1 2
Toluene  108-88-3 29
Treated ammonium chloride (with anti-caking agent a or b) 12125-02-9 1
Tributyl tetradecyl phosphonium chloride 81741-28-8 5
Tri-calcium silicate 12168-85-3 1
Tridecyl alcohol 112-70-9 1
Triethanolamine (2,2,2-nitrilotriethanol) 102-71-6 21
Triethanolamine polyphosphate ester 68131-71-5 3
Triethanolamine titanate 36673-16-2 1
Triethanolamine zirconate 101033-44-7 6
Triethanolamine zirconium chelate * 1
Triethyl citrate  77-93-0 1
Triethyl phosphate 78-40-0 1
Triethylene glycol 112-27-6 3
Triisopropanolamine 122-20-3 5
Trimethylammonium chloride 593-81-7 1
Trimethylbenzene 25551-13-7 5
Trimethyloctadecylammonium  (1-octadecanaminium, N,N,N-trimethyl-, chloride) 112-03-8 6
Tris(hydroxymethyl)aminomethane 77-86-1 1
Trisodium ethylenediaminetetraacetate 150-38-9 1
Trisodium ethylenediaminetriacetate 19019-43-3 1
Trisodium nitrilotriacetate 18662-53-8 8
Trisodium nitrilotriacetate (Nitrilotriacetic acid, trisodium salt monohydrate) 5064-31-3 9
Trisodium ortho phosphate 7601-54-9 1
Trisodium phosphate dodecahydrate 10101-89-0 1
Ulexite  1319-33-1 1 30
Chemical Component
Chemical
Abstract
Service
Number
No. of
Products
Containing
Chemical
Urea  57-13-6 3
Wall material  * 1
Walnut hulls  * 2
White mineral oil 8042-47-5 8
Xanthan gum 11138-66-2 6
Xylene  1330-20-7 44
Zinc chloride 7646-85-7 1
Zinc oxide  1314-13-2 2
Zirconium complex  * 10
Zirconium dichloride oxide 7699-43-6 1
Zirconium oxide sulfate 62010-10-0 2
Zirconium sodium hydroxy lactate complex (Sodium zirconium lactate) 113184-20-6 2
* Components marked with an asterisk appeared on at least one MSDS without an identifying
CAS number.  The MSDSs in these cases marked the CAS as proprietary, noted that the CAS was
not available, or left the CAS field blank.  Components marked with an asterisk may be
duplicative of other components on this list, but Committee staff have no way of identifying such
duplicates without the identifying CAS number.