Exemplary mixtures contain {TAIL ~ dichlorodifluoromethane} and from 35 to 50 percent chloropentafluoroethane, octafluoropropane or octafluorocyclobutane based on the mixtures of {HEAD ~ I} and II 
Exemplary mixtures contain { TAIL ~ dichlorodifluoromethane } and from 35 to 50 percent chloropentafluoroethane , octafluoropropane or octafluorocyclobutane based on the mixtures of { HEAD ~ I } and II
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH