Updated Bulletin

The Polyisocyanurate Insulation Manufacturers Association (PIMA) has issued a performance bulletin entitled Polyiso Insulation’s Low-GWP Blowing Agent Solution, which highlights the polyiso industry’s use of and the benefits provided by the pentane blowing agents used in polyiso formulations.

Closed-cell foam insulation products such as polyiso are manufactured with captive blowing agents. The blowing agents are primarily used to increase the final product’s thermal resistance or R-value. Polyiso products are manufactured using pentane or pentane blends. Pentane is a hydrocarbon with zero ozone depletion potential (ODP) and low global warming potential (GWP).

The polyiso industry transitioned to pentane blowing agents after years of research and development. These products replaced formulations using CFCs and HCFCs, which are no longer permitted for use in insulation products in major markets, including the United States and Canada. In closed-cell insulation products such as polyiso, the blowing agents are retained within the cell structure to provide long-term thermal performance. Polyiso is one of North America’s most widely-used and cost-effective insulation products. The updated bulletin can be found on PIMA’s website.


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