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