Code of Federal Regulations > Title 40 > Chapter I > Part 82 > Subpart G > Appendix Appendix K - Appendix K to Subpart G of Part 82—Substitutes Subject to Use Restrictions and Unacceptable Substitutes Listed in the July 22, 2002, Final Rule Effective August 21, 2002

Regulations last checked for updates: Mar 14, 2025

Title 40 - Protection of Environment last revised: Nov 14, 2025

Appendix Appendix K - Appendix K to Subpart G of Part 82—Substitutes Subject to Use Restrictions and Unacceptable Substitutes Listed in the July 22, 2002, Final Rule Effective August 21, 2002

Foam Blowing—Unacceptable Substitutes

End-use	Substitute	Decision	Comments
Replacements for HCFC-141b in the following rigid polyurethane/polyisocyanurate applications: —Boardstock —Appliance —Spray	HCFC-22, HCFC-142b and blends thereof	Unacceptable Closed cell foam products and products containing closed cell foams manufactured with these substitutes on or before December 1, 2017 may be used after that date	Alternatives exist with lower or zero-ODP.
All foam end-uses	HCFC-124	Unacceptable Closed cell foam products and products containing closed cell foams manufactured with this substitute on or before December 1, 2017 may be used after that date	Alternatives exist with lower or zero-ODP.

[81 FR 86883, Dec. 1, 2016]

authority: 42 U.S.C. 7414,7601,7671

source: 57 FR 33787, July 30, 1992, unless otherwise noted.