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Substitutes in Rigid Polyurethane, Slabstock and Other

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 in Rigid Polyurethane, Slabstock and Other

Substitute (and blends including that substitute) ODS Being Replaced
HCFC-123 CFC-11
HFC-134a CFC-11, HCFCs
HFC-152a CFC-11, HCFCs
HFC-245fa CFC-11, HCFCs
HCFC-141b/HCFC-123 Blends CFC-11
Formic Acid CFC-11, HCFCs
Saturated Light Hydrocarbons (C3-C6) CFC-11, HCFCs
Electroset Technology CFC-11; HCFC-22, HCFC-142b, and blends thereof
Carbon Dioxide CFC-11, HCFCs
Water HCFCs
Exxsol Blowing Agents HCFCs
Methyl Formate CFC-11
Ecomate CFCs, HCFCs
Transcend™ Technologies as an additive to SNAP-approved blowing agents in blends making up to 5% by weight of the total foam formulation CFCs, HCFCs
HFC-365mfc HCFC-141b; HCFC-22, HCFC-142b, and blends thereof
Formacel® TI HCFC-22, HCFC-142b
HFO-1234ze HCFC-22, HCFC-142b, and blends thereof
Trans-1-chloro-3,3,3-trifluoroprop-1-ene CFC-11, HCFC-141b
Formacel® 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 for either CFC-11 or HCFCs.

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, HCFC-141b Alternatives exist with lower or zero-ODP.

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