1,1,1,2,3,3,3-헵타플루오로프로판(HFC-227ea), 1,1,1,2,2,3-헥사플루오로프로판(HFC-236cb), 1,1,1,2,3,3-헥사플루오로프로판(HFC-236ea)과 1,1,1,3,3,3-헥사플루오로프로판(HFC-236fa)