Physical Properties: Chemical Name Chlorodifluoromethane Chemical Notation Chclf2 Molecular Weight 86.5 Boiling Point @ 1 Atm, ( ° F) -41.5 Freezing Point @ 1 Atm, ( ° F) -256 Critical Temperature ( ° F) ( Astm D-1321) 205.06 Critical Pressure* ( Psia) 723.74 Saturated Liquid Density @ 86° F, ( Lb/ Ft3) 73.1 Specific Heat Of Liquid @ 86° F, ( Btu/ Lb• ° F) 0.31 Specific Heat Of Vapor @ Constant Pressure* ( Cp) , @ 86° And 1 Atm, ( Btu/ Lb• ° F) 0.13 Flammable Range, % Vol. In Air ( Based On Ashrae Standard 34 With Match Ignition) † † None Ansiashrae Standard 36-1992 Safety Group Classification A1