abstract |
The present invention comprises difluoromethane (CH 3 F 2 , HFC-32) as the first component, perfluoro propane (C 3 F 8 , FC-218) and 1, 1-difluoroethane (CH 3 CHF 2 , HFC-152a), or cyclopropane (C 3 H 6 , RC-270) and 1,1,1,2,2-pentafluoropropane (CH 3 CF 2 HCFC-22 alternative refrigerant mixture comprising CF 3 , HFC-245cb) or butane (C 4 H 10 , R-600) and bis (difluoromethyl) ether (CHF 2 OCHF 2 , HFC-134) to provide. |