NotesU.S. production stopped December 31, 1995. Consider R-134a, R-401A, R-401B and R-409A. Chlorofluorocarbon (CFC) products such as R-12 are no longer manufactured but are still used in a variety of systems, and service refrigerant is sometimes still available in reclaimed form in some developed countries including the United States. In countries operating under “Article 5″ provisions of the Montreal protocol agreement, CFCs in virgin form are still available, although these countries are now beginning to implement CFC phase-outs.
Physical Properties
Chemical NameDichlorodifluoromethane
Chemical NotationCCl2F2
Molecular Weight (lbm/lbmol)120.9
Boiling Point @ 1 Atm, (°F)-21.6
Freezing Point @ 1 Atm, (°F)-252
Critical Temperature (°F) (ASTM D-1321)233.55
Critical Pressure* (psia)599.89
Saturated Liquid Density @ 86°F, (lb/ft3)81
Specific Heat of Liquid @ 86°F, (Btu/lb•°F)0.24
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
ANSI/ASHRAE Standard 34-1992 Safety Group ClassificationA1