The phase-out of CFC-11 as a foam-b...

The phase-out of CFC-11 as a foam-blowing agent, as called for in subordination to the Montreal Protocol, is well underway. The greatest in number common replacements with zero ozone depletion potential have been c-pentane and mixtures of c-pentane with other hydrocarbons, along with near HFCs, including HFC-134a and HFC-245fa.

Although HFC account for solely a small fraction of total greenhouse gas emissions, the global warming potential of chiefly HFCs is quite large. This raises legitimate questions regarding the appropriateness of using HFC as replacement blowing agents for foam. Refrigerators, however, make their largest contribution to global warming