Significant New Alternatives Policy (SNAP)

Substitutes in Rigid Polyurethane and Polyisocyanurate Laminated Boardstock

You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.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 acceptableHelpacceptableThis 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 unacceptableHelpUnacceptableThis 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.

           
Substitute ODPHelpODPA 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. GWPHelpGWPThe 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. SNAP Listing Date Comments [3] Flammable
2-Chloropropane 0 5 or less March 18, 1994;
June 19, 2000
Analysis of toxicity data available suggest an acceptable exposure limit of 350 ppm (8-hour time-weighted average). yes
Blends of HFC-245fa and HCFC-22 >0 N/A August 21, 2003;
July 20, 2015
Unacceptable as of September 18, 2015. no
Carbon Dioxide 0 1 March 18, 1994;
June 8, 1999
  no
EcomateTM 0 5 or less August 21, 2003   yes
Electroset Technology 0 N/A August 26, 1994;
June 16, 2010
  N/A
Exxsol Blowing Agents 0 5 or less December 6, 1999;
June 16, 2010
  yes
Formacel® TI 0 1,330 - 1,500 September 30, 2009;
July 20, 2015;
December 1, 2016
Acceptable subject to narrowed use limits for military or space- and aeronautics-related applications and unacceptable for all other uses as of January 1, 2017. Unacceptable for military applications as of January 1, 2022 and for space- and aeronautics-related applications as of January 1, 2025. no
Formic Acid 0 5 or less September 5, 1996   yes [2]
HCFC-123 0.02 77 March 18, 1994   no
HCFC-124 0.022 609 July 22, 2002 Unacceptable Substitute; Alternatives exist with lower or zero ODP. no
HCFC-141b 0.12 725 September 30, 2004;
July 20, 2015
Unacceptable Substitute; Alternatives exist with lower or zero ODP. no
HCFC-141b/HCFC-123 Blends >0 N/A March 18, 1994;
July 20, 2015
Unacceptable as of September 18, 2015. no
HCFC-22, HCFC-142b or blends thereof >0 N/A July 22, 2002;
July 20, 2015
Unacceptable Substitute; Alternatives exist with lower or zero ODP. no
HFC-134a 0 1,430 March 18, 1994;
June 8, 1999;
July 20, 2015;
December 1, 2016
HFC-134a and blends thereof acceptable subject to narrowed use limits for military or space- and aeronautics-related applications and unacceptable for all other uses as of January 1, 2017. Unacceptable for military applications as of January 1, 2022 and for space- and aeronautics-related applications as of January 1, 2025. no
HFC-152a 0 124 March 18, 1994;
June 8, 1999
  yes
HFC-245fa 0 1,030 December 6, 1999;
August 21, 2003;
July 20, 2015;
December 1, 2016
HFC-245fa and blends thereof acceptable subject to narrowed use limits for military or space- and aeronautics-related applications and unacceptable for all other uses as of January 1, 2017. Unacceptable for military applications as of January 1, 2022 and for space- and aeronautics-related applications as of January 1, 2025. no
HFC-365mfc 0 794 September 30, 2009;
June 16, 2010;
July 20, 2015;
December 1, 2016
HFC-365mfc and blends thereof acceptable subject to narrowed use limits for military or space- and aeronautics-related applications and unacceptable for all other uses as of January 1, 2017. Unacceptable for military applications as of January 1, 2022 and for space- and aeronautics-related applications as of January 1, 2025. yes
HFO-1234ze 0 6 June 16, 2010 CAS Reg. No. is 29118-24-9. Recommended workplace exposure limit of 1,000 ppm. no
HFO–1336mzz(Z) ((Z)-1,1,1,4,4,4-hexafluorobut-2-ene; FEA-1100; Formacel® 1100) 0 9 October 21, 2014   no
Methyl Formate 0 5 or less December 18, 2000   yes
Methylal (dimethoxymethane) 0 <3 October 21, 2014   yes
Saturated Light Hydrocarbons (C3-C6) 0 3 - 10 March 18, 1994;
April 11, 2000; June 16, 2010
  yes
Trans-1-chloro-3,3,3-trifluoroprop-1-ene (SolsticeTM 1233zd(E)) 0.00024 - 0.00034 4.7 - 7 August 10, 2012 CAS Reg. No. is 102687-65-0. The manufacturer recommends an acceptable exposure limit (AEL) of 300 ppm (8-hr TWA). no
TranscendTM Technologies 0 5 or less March 29, 2006 Acceptable as an additive to SNAP-approved blowing agents in blends making up to 5% by weight of the total foam formulation. yes[1]
Water 0 N/A June 8, 1999   no

1 When blended with fire retardant and/or other SNAP-approved alternatives, the flammability of TranscendTM Technologies can be reduced to make a formulation that is either combustible or non-flammable (contact the manufacturer of TranscendTM Technologies for more information).

2 Formic acid is mildly flammable with flashpoint of 68.9°C (156°F), lower flammability limit of 18.0% by volume, and NFPA flammability rating of 2.

3 Use of closed cell foam products and products that contain closed cell foam manufactured with an unacceptable foam blowing agent prohibited on or before the later of: 1) December 1, 2017, or 2) the date when the foam blowing agent is unacceptable.