Substitutes in Metals Cleaning
Substitutes are reviewed on the basis of ozone depletion potential, global warming potential, toxicity, flammability, exposure potential. Lists of acceptableThis designation means that a substitute may be used, without restriction, to replace the relevant ODS within the end-use specified. For example, HCFC-22 is an acceptable substitute for R-502 in industrial process refrigeration. Note that all SNAP determinations apply to the use of a specific product as a substitute for a specific ODS in a specific end-use. and UnacceptableThis designation means that it is illegal to use a product as a substitute for an ODS in a specific end-use. For example, HCFC-141b is an unacceptable substitute for CFC-11 in building chillers. Note that all SNAP determinations apply to the use of a specific product as a substitute for a specific ODS in a specific end-use. substitutes are updated several times each year. The list of acceptable substitutes are shown below.
Note: SNAP-related information published in the Federal Register takes precedence over all information on this page.
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| Substitute | Trade Name(s) | ODPA number that refers to the amount of ozone depletion caused by a substance. The ODP is the ratio of the impact on ozone of a chemical compared to the impact of a similar mass of CFC-11. Thus, the ODP of CFC-11 is defined to be 1.0. Other CFCs and HCFCs have ODPs that range from 0.01 to 1.0. The halons have ODPs ranging up to 10. Carbon tetrachloride has an ODP of 1.2, and methyl chloroform's ODP is 0.11. HFCs have zero ODP because they do not contain chlorine. A table of all ozone-depleting substances (http://www.epa.gov/ozone/science/ods/index.html) shows their ODPs, GWPs, and CAS numbers. | GWPThe index used to translate the level of emissions of various gases into a common measure in order to compare the relative radiative forcing of different gases without directly calculating the changes in atmospheric concentrations. GWPs are calculated as the ratio of the radiative forcing that would result from the emissions of one kilogram of a greenhouse gas to that from the emission of one kilogram of carbon dioxide over a period of time (usually 100 years). Gases involved in complex atmospheric chemical processes have not been assigned GWPs. See lifetime. | Flammable | SNAP Listing Date | Listing Status | Further Information |
| Aqueous cleaners | 0 | N/A | no | March 18, 1994 | Acceptable | EPA is planning to issue effluent guidelines for this industry under the Clean Water Act. | |
| Chlorobromomethane | 0.07 to 0.15 | N/A | no | April 28, 1999 (pdf) (236 KB) | Unacceptable | Alternatives exist with lower or zero ODP. | |
| Dibromomethane | 0.17 | N/A | no | June 13, 1995 (pdf) (223 KB) | Unacceptable | Alternatives exist with lower or zero ODP. | |
| HCFO-1233yd(Z) | 0.00003 | <1 | no | January 20, 2022 (pdf) (376 KB) | Acceptable | ||
| HCFC-141b and its blends | N/A | N/A | N/A | October 16, 1996 | Unacceptable | Alternatives exist with lower or zero ODP. | |
| HCFC-225ca | 0.025 | 122 | no | December 20, 2002 (pdf) (168 KB) | Acceptable | EPA recommends observing the manufacturer’s recommended exposure guidelines of 50 ppm for the -ca isomer, 400 ppm for the -cb isomer, and 100 ppm for the commercial mixture of HCFC-225ca/cb; EPA encourages users to consider other alternatives that do not have an ozone depletion potential. | |
| HCFC-225cb | 0.033 | 595 | no | December 20, 2002 (pdf) (168 KB) | Acceptable | EPA recommends observing the manufacturer’s recommended exposure guidelines of 50 ppm for the -ca isomer, 400 ppm for the -cb isomer, and 100 ppm for the commercial mixture of HCFC-225ca/cb; EPA encourages users to consider other alternatives that do not have an ozone depletion potential. | |
| Heptafluorocyclopentane | 0 | 250 | no | December 18, 2000 (pdf) (257 KB) | Acceptable | EPA expects users to adhere to an exposure limit of 123 ppm over an eight-hour time-weighted average, with a ceiling of 500 ppm. | |
| HFC-365mfc | 0 | 794 | yes | December 18, 2000 (pdf) (257 KB) | Acceptable | ||
| HFC-4310mee | 0 | 1,640 | no | April 28, 1999 (pdf) (236 KB); June 8, 1999 (pdf) (143 KB) |
Acceptable | Company-set time-weighted average workplace exposure standard of 200 ppm, and a workplace exposure ceiling of 400 ppm. | |
| HFE-449s1 (methoxynonafluorobutane, iso and normal) | Novec™ 7100 Engineered Fluid (HFE-7100) | 0 | 297 | no | September 5, 1996; December 18, 2000 (pdf) (257 KB) |
Acceptable | |
| HFE-569sf2 (ethoxynonafluorobutane, iso and normal) | Novec™ 7200 Engineered Fluid (HFE-7200) | 0 | 59 | no | December 6, 1999 (pdf) (226 KB); December 18, 2000 (pdf) (257 KB) |
Acceptable | The Agency expects that any exposures will not exceed any acceptable exposure limits set by any voluntary consensus standards organization, including the American Conference of Governmental Industrial Hygienists' (ACGIH) threshold limit values (TLVs) or the American Industrial Hygiene Association's (AIHA) workplace environmental exposure limits (WEELs). |
| Methylene chloride | 0 | 8.7 | no | March 18, 1994 | Acceptable | OSHA and RCRA standards must be met. EPA issued Maximum Achievable Control Technology requirements under the Clean Air Act for vapor degreasing in November 1994. | |
| Monochlorotoluenes and benzotrifluorides | N/A | N/A | N/A | May 22, 1996 | Acceptable with Use Conditions: Subject to a 50 ppm workplace standard for monochlorotoluenes and a 100 ppm standard for benzotrifluoride. | The workplace standard for monochlorotoluenes is based on an OSHA PEL of 50 ppm for orthochlorotoluene. The workplace standard for benzotrifluoride is based on the company-set acceptable exposure limit. | |
| n-propyl bromide (nPB) | 0.0049 | 1.57 | no | May 30, 2007 (pdf) (267 KB) | Acceptable | CAS Reg. No. is 106-94-5. EPA recommends the use of personal protective equipment, including chemical goggles, flexible laminate protective gloves and chemical-resistant clothing; EPA expects that all users of nPB would comply with any final Permissible Exposure Limit that the Occupational Safety and Health Administration issues in the future under 42 U.S.C. 7610(a). | |
| Perchloroethylene | 0.005 | N/A | no | March 18, 1994 | Acceptable | OSHA and RCRA standards must be met. EPA issued Maximum Achievable Control Technology requirements under the Clean Air Act for vapor degreasing in November 1994. | |
| Perfluorobutyl Iodide (PFBI) | <0.005 | <5 | no | October 4, 2011 (pdf) (201 KB) | Acceptable | CAS Reg. No. is 423-39-2; EPA recommends an acceptable exposure limit of 375ppm (8-hour time-weighted average) for PFBI; Observe recommendations in the manufacturer’s MSDS and guidance for using this substitute, particularly with respect to disposal. Prevent the solvent from entering waterways; PFBI is currently defined as a volatile organic compound (VOC) under CAA regulations (see 40 CFR 51.100(s)). | |
| Semi-aqueous cleaners | 0 | N/A | no | March 18, 1994 | Acceptable | EPA is planning to issue effluent guidelines for this industry under the Clean Water Act. | |
| Straight organic solvent cleaning (with terpenes, C6-C20 petroleum hydrocarbons, oxygenated organic solvents such as ketones, esters, ethers, alcohols, etc.) | 0 | N/A | N/A | March 18, 1994 | Acceptable | OSHA standards must be met, if applicable. | |
| Straight organic solvent cleaning with petroleum hydrocarbon C5 | 0 | N/A | N/A | February 24, 1998 (pdf) (140 KB) | Acceptable | ||
| Supercritical fluids | 0 | N/A | N/A | March 18, 1994 | Acceptable | ||
| The Mini-Max Cleaner® | The Mini-Max Cleaner® | 0 | 0 | N/A | September 28, 2006 (pdf) (183 KB) | Acceptable | |
| Trans-1,2-dichloroethylene | 0 | N/A | yes | August 26, 1994 | Acceptable | The OSHA set exposure limit is 200 ppm. | |
| Trans-1-chloro-3,3,3-trifluoroprop-1-ene | Solstice® 1233zd(E) | 0.00024 - 0.00034 | 4.7 - 7 | no | May 17, 2013 (pdf) (280 KB) | Acceptable | CAS Reg. No. is 102687-65-0; The manufacturer recommends an acceptable exposure limit of 300 ppm over an 8-hour time-weighted average for trans-1-chloro-3,3,3-trifluoroprop-1-ene; Note that this substitute boils at room temperature. Therefore, EPA recommends using this substitute in equipment designed to minimize solvent losses, emissions and worker exposure. Examples of such equipment include containers with connected hoses and valves that allow for direct transfer of the solvent to cleaning equipment without opening of the storage container, and enclosed or low-emission cleaning equipment. Observe recommendations in the manufacturer’s MSDS and guidance for using this substitute. |
| Methoxytridecafluoroheptene isomers (MPHE) | SionTM | 0 | 2.5 | no | July 16, 2015 (pdf) (354 KB) | Acceptable | MPHE is a mixture of structural and stereo isomers, which includes trans-5-methoxy-perfluoro-3-heptene and eight isomeric structures. The manufacturer recommends an AEL of 500 ppm (8-hr TWA) for MPHE. |
| Trichloroethylene | 0.00037 | N/A | yes | March 18, 1994 | Acceptable | OSHA and RCRA standards must be met. EPA issued Maximum Achievable Control Technology requirements under the Clean Air Act for vapor degreasing in November 1994. | |
| Vanishing oils | 0 | N/A | no | March 18, 1994 | Acceptable | Depending on geographic region, may be subject to VOC controls. | |
| Volatile methyl siloxanes | 0 | N/A | yes | August 26, 1994 | Acceptable | Approval is granted for the whole class of compounds. | |
| HFE-64-13m(m)yy(s)c3 (1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)pentane) | Novec™ 7300 Engineered Fluid (HFE-7300) | 0 | 310 | no | July 21, 2017 (pdf) (314 KB) | Acceptable | The manufacturer recommends an AEL for the workplace for HFE-7300 of 100 ppm (8-hr TWA). This substitute is subject to a Toxic Substance Control Act (TSCA) section 5(a)(2) Significant New Use Rule (SNUR) (40 CFR 721.10061). |
| HFO-1336mzz(Z) | 0 | 9 | no | October 4, 2018 | Acceptable |