Substitutes in Industrial Process Refrigeration
Substitutes are reviewed on the basis of environmental and health risks, including factors such as ozone depletion potential, global warming potential, toxicity, flammability, and 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 substitutes is shown below.
Many acceptable substitutes under SNAP may be restricted under the Technology Transitions Program. Find more information on Technology Transitions Program restrictions.
Note: SNAP-related information published in the Federal Register takes precedence over all information on this page.
| Substitute | Trade Name(s) | Retrofit/ New | 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. | ASHRAEASHRAE is an international organization that establishes standards for the uniform testing and rating of heating, ventilation, air conditioning, and refrigeration equipment. It also conducts related research, disseminates publications, and provides continuing education to its members. Designation (Safety Classification) | SNAP Listing Date | Listing Status | |
|---|---|---|---|---|---|---|---|
| Ammonia Absorption | N | 0 | 0 | B2 | September 5, 1996; June 16, 2010 (pdf) (229KB) | Acceptable | |
| Ammonia Vapor Compression | N | 0 | 0 | B2 | March 18, 1994; September 5, 1996; June 16, 201 (pdf) (229KB) | Acceptable | |
| Chlorine | R/N | N/A | N/A | A1 | March 18, 1994 | Acceptable | |
| Desiccant Cooling | N | 0 | N/A | N/A | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| Direct Nitrogen Expansion | N | 0 | 0 | A1 | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| Evaporative Cooling | N | 0 | N/A | N/A | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| FOR12A | FOR12A | R/N | 0 | 1,100 | A1 | December 18, 2000 (pdf) (257KB) | Acceptable |
| FOR12B | FOR12B | R/N | 0 | 1,000 | A1 | December 18, 2000 (pdf) (257KB) | Acceptable |
| RB-276 | Free Zone, HCFC Blend Delta | R/N | 0.013 | 1,592 | A1 | September 5, 1996 | Acceptable |
| Freeze 12 | Freeze 12 | R/N | 0.013 | 1,606 | A1 | September 5, 1996 | Acceptable |
| R-1224yd(Z) | AMOLEA™ yd | R/N | 0.00012 | 1 | A1 | November 25, 2019 (pdf) (273KB) | Acceptable |
| R-416A | FRIGC FR-12, HCFC Blend Beta | R/N | 0.009 | 1,081 | A1 | February 8, 1996 (pdf) (152KB); February 24, 1998 (pdf) (140KB) | Acceptable |
| G2018C | G2018C | R/N | 0.053 | 1,731 | A1 | September 5, 1996 | Acceptable |
| GHG-HP | HCFC Blend Lambda | R/N | 0.056 | 1,893 | A1 | February 8, 1996 (pdf) (152KB) | Acceptable |
| R-414A | GHG-X4, Autofrost, Chill-it, HCFC Blend Xi | R/N | 0.045 | 1,478 | A1 | September 5, 1996 | Acceptable |
| GHG-X5 | GHG-X5 | R/N | 0.032 | 2,377 | A1 | June 3, 1997 (pdf) (133KB) | Acceptable |
| HC Blend B | Original formulation of HC-12a | R/N | 0 | 4 | A3 | January 13, 1995 (pdf) (186KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| HC Blend A | OZ-12 | R/N | 0 | 3 | A3 | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable |
| HCFC-123 | R/N | 0.02 | 77 | B1 | August 26, 1994 | Acceptable | |
| HCFC-22 | R/N | 0.055 | 1,810 | A1 | March 18, 1994 | Acceptable | |
| HCFO-1233zd(E) | Solstice® N12, Solstice® 1233zd(E) | R/N | <0.0004 | 3.7 | A1 | December 11, 2020 (pdf) (263KB) | Acceptable |
| HCFC-22/HCFC-142b | R/N | 0.055-0.065 | 1,810-2,310 | A1 | June 3, 1997 (pdf) (133KB) | Acceptable | |
| HFC-134a | R/N | 0 | 1,430 | A1 | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| HFC-134a/HBr (92/8) | N | 0.0016 | N/A | A1 | May 23, 2001 (pdf) (145KB) | Acceptable | |
| HFC-227ea | N | 0 | 3,220 | A1 | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable with Use Conditions: When manufactured using any process that does not convert perfluoroisobutylene (PFIB) directly to HFC-236fa in a single step. | |
| HFC-23 | R/N | 0 | 14,800 | A1 | August 26, 1994 | Acceptable | |
| HFC-236fa | R/N | 0 | 9,810 | A1 | March 10, 1997 (pdf) (127KB) | Acceptable | |
| HFC-245fa | Genetron® 245fa | R/N | 0 | 1,030 | A1 | March 29, 2006 (pdf) (181KB) | Acceptable |
| HFE-347mcc3 (heptafluoropropyl methyl ether) | Novec™ 7000 Engineered Fluid (HFE-7000) | R/N | 0 | 575 | A1 | March 22, 2002 (pdf) (156KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| HFE-449s1 (methoxynonafluorobutane, iso and normal) | Novec™ 7100 Engineered Fluid (HFE-7100) | N | 0 | 297 | A1 | December 18, 2000 (pdf) (257KB); June 16, 2010 (pdf) (229KB) | Acceptable: Only acceptable for use as a secondary heat transfer fluid in not-in-kind systems. |
| HFE-569sf2 (ethoxynonafluorobutane, iso and normal) | Novec™ 7200 Engineered Fluid (HFE-7200) | N | 0 | 59 | N/A | December 18, 2000 (pdf) (257KB); June 16, 2010 (pdf) (229KB) | Acceptable: Only acceptable for use as a secondary heat transfer fluid in not-in-kind systems. |
| R-414B | Hot Shot, Kar Kool, HCFC Blend Omicron | R/N | 0.098 | 3,337 | A1 | September 5, 1996 | Acceptable |
| R-417C | Hot Shot 2 | R | 0 | 1,820 | A1 | October 4, 2011 (pdf) (201KB) | Acceptable |
| Ikon A | Ikon-12, Blend Zeta | N | 0 | N/A | A1 | June 19, 2000 (pdf) (224KB) | Acceptable |
| Ikon B | R/N | 0 | N/A | A1 | December 6, 1999 (pdf) (226KB) | Acceptable | |
| NARM-502 | R/N | >0 | N/A | A1 | September 5, 1996 | Acceptable | |
| R-125/R-134a/R-600a (28.1/70.0/1.9) | NU-22 old composition | R/N | 0 | 1,990 | A1 | June 16, 2010 (pdf) (229KB) | Acceptable |
| R-125/R-290/R-134a/R-600a (55.0/1.0/42.5/1.5) | ICOR AT-22 | R/N | 0 | 2,530 | A1 | March 29, 2006 (pdf) (181KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-1270 (Propylene) | R/N | 0 | 5 | A3 | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| R-290 (Propane) | R/N | 0 | 3 | A3 | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| R-401A | SUVA MP-39 | N | 0.037 | 1,182 | A1 | January 13, 1995 (pdf) (186KB) | Acceptable |
| R-401B | SUVA MP-66 | N | 0.040 | 1,288 | A1 | January 13, 1995 (pdf) (186KB) | Acceptable |
| R-402A | HP-80 | R/N | 0.019 | 2,746 | A1 | March 18, 1994 | Acceptable |
| R-402B | HP-81 | R/N | 0.03 | 2,379 | A1 | March 18, 1994 | Acceptable |
| R-403B | ISCEON 69-L | R/N | 0.041 | 3,096 | A1 | August 26, 1994 | Acceptable |
| R-404A | SUVA HP-62 | R/N | 0 | 3,920 | A1 | March 18, 1994; March 22, 2002 (pdf) (156KB) | Acceptable |
| R-406A | GHG-12, GHG-X3, McCool, Autofrost X3 | R | 0.057 | 1,900 | A2 | August 26, 1994 | Acceptable |
| R-407A | Klea 60, Klea 407A | R/N | 0 | 2,110 | A1 | August 26, 1994; June 16, 2010 (pdf) (229KB) | Acceptable |
| R-407B | Klea 61 | R/N | 0 | 2,800 | A1 | August 26, 1994; June 16, 2010 (pdf) (229KB) | Acceptable |
| R-407C | Suva 407C, Klea 407C | R/N | 0 | 1,770 | A1 | February 8, 1996 (pdf) (152KB); December 20, 2002 (pdf) (168KB); August 21, 2003 (pdf) (161KB) | Acceptable |
| R-407F | Genetron Performax LT | R/N | 0 | 1,820 | A1 | October 4, 2011 (pdf) (201KB) | Acceptable |
| R-408A | HCFC Blend Epsilon | R | 0.026 | 3,152 | A1 | August 26, 1994 | Acceptable |
| R-410A | AZ-20, Suva 9100, Puron | N | 0 | 2,090 | A1 | February 8, 1996 (pdf) (152KB); December 20, 2002 (pdf) (168KB) | Acceptable |
| R-410B | N | 0 | 2,230 | A1 | February 8, 1996 (pdf) (152KB); June 16, 2010 (pdf) (229KB) | Acceptable | |
| R-411A | R/N | 0.048 | 1,600 | A2 | February 8, 1996 (pdf) (152KB) | Acceptable | |
| R-411B | R/N | 0.052 | 1,700 | A2 | February 8, 1996 (pdf) (152KB) | Acceptable | |
| R-417A | ISCEON 59, NU-22 | R/N | 0 | 2,350 | A1 | December 6, 1999 (pdf) (226KB); December 18, 2000 (pdf) (257KB); December 20, 2002 (pdf) (168KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-420A | Choice R-420A | R/N | 0.008 | 1,536 | A1 | October 1, 2004 (pdf) (186KB) | Acceptable |
| R-421A | Choice R-421A | R/N | 0 | 2,630 | A1 | September 28, 2006 (pdf) (183KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-421B | Choice R-421B | R/N | 0 | 3,190 | A1 | September 28, 2006 (pdf) (183KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-422A | ISCEON 79 | R/N | 0 | 3,140 | A1 | October 1, 2004 (pdf) (186KB) | Acceptable |
| R-422B | ICOR XAC1, NU-22B | R/N | 0 | 2,530 | A1 | March 29, 2006 (pdf) (181KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-422C | ICOR XLT1 | R/N | 0 | 3,390 | A1 | March 29, 2006 (pdf) (181KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-422D | ISCEON MO29 | R/N | 0 | 2,730 | A1 | September 28, 2006 (pdf) (183KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-423A | ISCEON 39TC | R/N | 0 | 2,280 | A1 | March 22, 2002 (pdf) (156KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-424A | RS-44 | R/N | 0 | 2,440 | A1 | September 28, 2006 (pdf) (183KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-426A | RS-24 | R/N | 0 | 1,510 | A1 | September 28, 2006 (pdf) (183KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-427A | Forane® 427A | R | 0 | 2,140 | A1 | June 16, 2010 (pdf) (229KB) | Acceptable |
| R-428A | RS-52 | N | 0 | 3,610 | A1 | October 4, 2007 (pdf) (163KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-434A | RS-45 | R/N | 0 | 3,250 | A1 | October 4, 2007 (pdf) (163KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-437A | KDD6, ISCEON MO49 Plus | R/N | 0 | 1,810 | A1 | January 2, 2009 (pdf) (173KB) | Acceptable |
| R-438A | KDD5, ISCEON MO99 | R/N | 0 | 2,270 | A1 | October 4, 2007 (pdf) (163KB); June 16, 2010 (pdf) (229KB) | Acceptable |
| R-471A | Solstice® N71 | R/N | 0 | 144 | A1 | September 8, 2023 (pdf) (247KB) December 11, 2024 (pdf) (300KB) | Acceptable |
| R-450A | Solstice® N-13 | R/N | 0 | 601 | A1 | October 21, 2014 (pdf) (346KB) | Acceptable |
| R-507, R-507A | AZ-50 | R/N | 0 | 3,990 | A1 | March 18, 1994; September 5, 1996; December 20, 2002 (pdf) (257KB) | Acceptable |
| R-508A | Klea 5R3, PFC Blend Alpha | R/N | 0 | 13,214 | A1 | July 28, 1995 (pdf) (141KB) | Acceptable |
| R-508B | Suva 95 | R/N | 0 | 13,396 | A1 | July 28, 1995 (pdf) (141KB) | Acceptable |
| R-513A | Opteon™ XP 10 | R/N | 0 | 630 | A1 | July 16, 2015 (pdf) (354KB) | Acceptable |
| R-600 (Butane) | R/N | 0 | 3 | A3 | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| R-744 (Carbon Dioxide, CO2) | R/N | 0 | 1 | A1 | January 13, 1995 (pdf) (186KB); June 16, 2010 (pdf) (229KB) | Acceptable | |
| RS-24 (2002 formulation) | R/N | 0 | 1,510 | A1 | December 20, 2002 (pdf) (168KB); June 16, 2010 (pdf) (229KB) | Acceptable | |
| RS-44 (2003 formulation) | R/N | 0 | 2,420 | A1 | June 16, 2010 (pdf) (229KB) | Acceptable | |
| SP34E | SP34E | R/N | 0 | <1,470 | A1 | December 18, 2000 (pdf) (257KB) | Acceptable |
| Stirling Cycle | N | 0 | N/A | N/A | March 18, 1994; June 16, 2010 (pdf) (229KB) | Acceptable | |
| THR-02 | R/N | 0 | N/A | A1 | December 6, 1999 (pdf) (226KB) | Acceptable | |
| THR-03 | R/N | 0 | N/A | A1 | December 6, 1999 (pdf) (226KB) | Acceptable | |
| THR-04 | R/N | >0 | N/A | A1 | June 8, 1999 (pdf) (143KB) | Acceptable | |
| R-448A | Solstice® N-40 | R/N | 0 | 1,387 | A1 | July 21, 2017 (pdf) (314KB) | Acceptable |
| R-449A | Opteon™ XP 40 | R/N | 0 | 1,400 | A1 | July 21, 2017 (pdf) (314KB) | Acceptable |
| R-449B | Forane® 449B | R/N | 0 | 1,412 | A1 | July 21, 2017 (pdf) (314KB) | Acceptable |
| R-453A | RS-70 | R/N | 0 | 1,770 | A1 | July 21, 2017 (pdf) (314KB) | Acceptable |
| R-458A | Bluon TdX 20 | R/N | 0 | 1,650 | A1 | July 21, 2017 (pdf) (314KB) | Acceptable |
| HFC-32 | N | 0 | 675 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. | |
| HFO-1234yf | N | 0 | 1 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. | |
| HFO-1234ze(E) | N | 0 | 1 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. | |
| R-454A | Opteon™ XL40 | N | 0 | 237 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-454B | Opteon™ XL41 | N | 0 | 465 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-454C | Opteon™ XL20 | N | 0 | 146 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-455A | Solstice® L40X | N | 0 | 146 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-457A | Forane® 457A | N | 0 | 137 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. |
| R-516A | Forane® 516A | N | 0 | 140 | A2L | June 13, 2024 (pdf) (1.17MB) | Acceptable subject to use conditions: See rule for detailed conditions. |
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