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Substitutes in Rigid Polyurethane: Spray, Commercial Refrigeration, and Sandwich Panels

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 (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; HCFC-141b, HCFC-142b, HCFC-22 (not listed as a substitute in spray foam applications)
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, HCFCs
Ecomate
CFCs, HCFCs
HFO-1234ze
CFCs, HCFCs
HFC-365mfc
HCFC-141b; HCFC-22, HFC-142b, and blends thereof (not listed as a substitute in spray foam applications)
Blends of HFC-365mfc and HFC-245fa, containing at least 5% HFC-245fa
HCFC-141b; HCFC-22, HFC-142b, and blends thereof
Formacel® TI
HCFC-22, HCFC-142b
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
Trans-1-chloro-3,3,3-trifluoroprop-1-ene CFC-11, HCFC-141b
Formacel® Z-6 HCFC-22, HCFC-142b, and blends thereof (not listed as a substitute in spray foam applications)
Commercial blends of HFC-365mfc and HFC-227ea containing 7% to 13% HFC-227ea and the remainder HFC-365mfc (Solkane® 365/227) All

Substitutes that are Acceptable with Use Conditions

None at this time for either CFC-11 or HCFCs.

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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