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Substitutes in Polystyrene, Extruded Boardstock and Billet

Substitutes are reviewed on the basis of ozone depletion potential, global warming potential, toxicity, flammability, and exposure potential. Lists of acceptable and unacceptable substitutes are updated several times each year. A chronological list of SNAP updates is also available.

Note: SNAP Notices and Final Rules published in the Federal Register take precedence over all information on the web site.

Acceptable Substitutes
Substitute ODS Being Replaced
HFC-134a CFC-12, HCFCs
HFC-152a CFC-12, HCFCs
Saturated Light Hydrocarbons (C3-C6) CFC-12, HCFCs
Electroset Technology CFC-12; HCFC-22, HCFC-142b, and blends thereof
Carbon Dioxide CFC-12, HCFCs
Water HCFCs
HFC-245fa CFC-11, HCFCs
Exxsol Blowing Agents HCFCs
Ecomate™ CFC-12, HCFCs
Formacel B HCFC-22, HCFC-142b
HFO-1234ze CFCs, HCFCs
HFC-365mfc HCFC-141b; HCFC-22, HCFC-142b, and blends thereof
Formacel® TI HCFC-22, HCFC-142b
FormacelŪ Z-6 HCFC-22, HCFC-142b, and blends thereof

Substitutes that are Acceptable with Use Conditions
None at this time.

Substitutes that are Acceptable with Narrowed Use Restrictions
None at this time.

Unacceptable Substitutes
Substitute ODS Being Replaced Further Information
HCFC-124 All Alternatives exist with lower or zero-ODP.
HCFC-141b All Alternatives exist with lower or zero-ODP. Exemptions exist for (1) the use of HCFC-141b for space vehicle, nuclear and defense foam applications, (2) the use of HCFC-141b for laboratory research and development applications for foreign customers and (3) the use of fully formulated HCFC-141b foam systems in inventory before January 1, 2005, until July 1, 2005. See the September 30, 2004, final rule, 69 FR 58269, for further information.
HCFC-22, HCFC-142b or blends thereof CFCs Alternatives exist with lower or zero-ODP. (For existing users of HCFC-22 and HCFC-142b in polystyrene extruded insulation boardstock and billet as of November 4, 2005, the unacceptability determination is effective on January 1, 2010.

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