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EVALUATION OF HFC 245CA AND HFC 236EA AS FOAM BLOWING AGENTS
Citation:
Sharpe, J., D. MacArthur, T. Kollie, R. Graves, M. Liu, AND R. Hendriks. EVALUATION OF HFC 245CA AND HFC 236EA AS FOAM BLOWING AGENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/242 (NTIS PB95155032).
Description:
The paper gives results of a limited evaluation of the developmental hydrofluorocarbons (HFCS) 245ca and 236ea as blowing agents in urethane-based insulation. hese materials were selected from screening tests of 37 C2, C3, and C4 isomers based on physical properties, atmospheric lifetime, flammability, estimated toxicity, difficulty of synthesis, suitability for dual use as a refrigerant, and other factors. olubility of the two materials in typical foam components was tested, pour foaming trials were performed, and preliminary data were gathered regarding foam insulation performance. (NOTE: Hydrochlorofluorocarbons (HCFCS) have been widely adopted as interim blowing agents in urethane insulation. ue to their scheduled phaseout beginning in the year 2002, research efforts are being devoted to identifying a,nd developing alternatives with zero ozone depletion potential. hysical blowing agents identified have included hydrocarbons, fluorocarbons, hydrofluoroethers, and more predominantly, HFCS. ost HFC evaluations have focused on the more readily available low boiling candidates such as HFC 134a. igher boiling HFC candidates that could be handled at ambient conditions and use current processing equipment would be more desirable.)
