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.
|Substitute||ODS Being Replaced|
|Saturated Light Hydrocarbons (C3-C6)||CFC-12, HCFCs|
|Electroset Technology||CFC-12; HCFC-22, HCFC-142b, and blends thereof|
|Carbon Dioxide||CFC-12, HCFCs|
|Exxsol Blowing Agents||HCFCs|
|Formacel B||HCFC-22, HCFC-142b|
|HFC-365mfc||HCFC-141b; HCFC-22, HCFC-142b, and blends thereof|
|Formacel® TI||HCFC-22, HCFC-142b|
|Formacel® Z-6||HCFC-22, HCFC-142b, and blends thereof|
|Commercial blends of HFC-365mfc and HFC-227ea containing 7% to 13% HFC-227ea and the remainder HFC-365mfc (Solkane® 365/227)||All|
None at this time.
None at this time.
|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.|