Substitutes in Polystyrene, Extruded Sheet

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 for ODS in Extruded Sheet Poly**styrene
Substitute (and blends including that substitute)	ODS Being Replaced
HFC-134a	CFC-12
HFC-152a	CFC-12
Saturated Light Hydrocarbons (C3-C6)	CFC-12, HCFC-141b
HFC-245fa	CFC-11, HCFC-141b
Exxsol Blowing Agents	HCFC-141b
Electroset Technology	CFC-12
Carbon Dioxide	CFC-12
Ecomate™	CFCs, HCFCs
HFC-365mfc	HCFC-141b
Formacel® TI	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.

Substitutes in Polystyrene, Extruded Sheet

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

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