Title: Dichlorodifluoromethane
CAS Registry Number: 75-71-8
Additional Names: Difluorodichloromethane
Trademarks: Arcton 12 (ICI); Freon 12 (DuPont); Frigen 12 (Hoechst); Genetron 12 (AlliedSignal); Halon; Isotron 2
Molecular Formula: CCl2F2
Molecular Weight: 120.91
Percent Composition: C 9.93%, Cl 58.64%, F 31.43%
Literature References: Prepn: Henne, Org. React. 2, 49 (1944); Swarts, Chem. Zentralbl. 1907, II, 581. Manuf: Faith, Keyes & Clark's Industrial Chemicals, F. A. Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed., 1975) pp 325-330.
Properties: Colorless, practically odorless, noncorrosive, nonirritating, nonflammable gas. Faint, ether-like odor in high concentrations. Stable up to 550°. dliq-29.8 1.486. mp -158°. bp760 -29.8°; bp2atm -12.2°; bp5atm 16.1°; bp10atm 42.4°; bp20atm 74.0°; bp30atm 95.6°. Critical temp 111.5°; critical pressure 39.6 atm (582 lb/sq inch). Dipole moment 0.51. Insol in water. Sol in alcohol, ether. Absorbs less than 0.0025% water. Has little, if any, anesthetic or toxic action, but toxic substances may be formed on contact with a flame or hot metal surface.
Melting point: mp -158°
Boiling point: bp760 -29.8°; bp2atm -12.2°; bp5atm 16.1°; bp10atm 42.4°; bp20atm 74.0°; bp30atm 95.6°
Density: dliq-29.8 1.486
CAUTION: Potential symptoms of overexposure are dizziness, tremors, asphyxia, unconsciousness, cardiac arrhythmias and cardiac arrest; direct contact with liquid may cause frostbite. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 96. Note: Consult latest Government regulations on use as aerosol propellant.
Use: Refrigerant, aerosol propellant.

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