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Blowing agents are one of the integral parts of a polyurethane foam. Foam generation can be achieved by an external blowing agent such as a low boiling liquid which evaporates during urethane formation, by a gas dissolved under pressure or by chemical reaction. Fluorocarbons are the most common blowing agents used in polyurethane foams. They offer the advantage of being non flammable, having excellent thermal characteristic and the right boiling point. Over time the fluorocarbon gas diffuses out of the foam and enters the atmosphere. Fluorocarbons have been found responsible for their ozone depletion potential. The EPA has regulated the use of fluorocarbons in foams and has established suitable alternate replacements. For Europe consult this site.  Please consult this site for the latest approved blowing agent for a certain application. In the long run all fluorocarbons and other blowing agents will be replaced with carbon dioxide as a blowing agent.
Blowing Agents Overview CAS # Name Composition Properties
Gas volume  tables Calculated foam density
Blowing Agents Trade name Properties Regulatory  Other
Toxicity Degradation Analysis Human Sampling

Links to general information

EPA  regulations Halocarbon production Supplier of HFC

Last edited on:

November 14, 2006

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