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
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

**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.

Substitutes in Polystyrene, Extruded Boardstock and Billet

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