Who's made the blowing-agent conversion?
Dec. 31 marks a significant milestone for polyisocyanurate insulation manufacturers—they must convert to third-generation blowing agents for their polyisocyanurate products. If you are involved in specifying, purchasing or installing rigid board polyisocyanurate roof insulation, you need to be aware of the changes.
Citing concerns with the ozone-depleting potential of certain chemicals, the U.S. Environmental Protection Agency (EPA) mandated reductions in the use of a number of chemicals. Such a mandate was the primary reason for polyisocyanurate insulation manufacturers to change the blowing agent (a raw material component used when manufacturing polyisocyanurate insulation) from chlorofluorocarbon to hydrochlorofluorocarbon (HCFC-141b) during the early 1990s.
Polyisocyanurate insulation manufacturers now face an additional EPA-mandated deadline. After Dec. 31, chemical manufacturers no longer will be permitted to produce HCFC-141b. As a result, polyisocyanurate insulation manufacturers again are forced to change a critical component in the manufacturing of polyisocyanurate insulation.
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