HCFC-22 (chloro-difluoro-methane)

Chemical Formula: CHClF₂ 

Common synonyms:
Chlorofluorocarbon 22;

Difluorochloromethane;Difluoromonochloromethane;

FC 22; Flugene™ 22; Fluorocarbon 22;

HCFC 22; HFA 22; Hydrochlorofluorocarbon 22; Hydrofluoroalkane22;

Propellant 22; R 22; Refrigerant 22;

Conversion factors:
1 ppm = 3.54 mg/m³
1 mg/ m3 = 0.282 ppm

Properties

Chlorodifluoromethane is a non-flammable, colorless and nearly odorless gas under normal conditions. A large proportion is used as a chemical intermediate and therefore not emitted into the atmosphere. Other important uses are in refrigeration and in air conditioning systems; with present practice, most of the chlorodifluoromethane so used will eventually be emitted into the atmosphere.

Its moderate water solubility and low octanol/water partition coefficient indicate a negligible bioaccumulation potential. Contamination of water and food would not be expected from its physical and chemical properties and has not been reported.

HCFC-123 (2,2-dichloro-1,1,1- trifluoro-ethane)

Common synonyms:
Fluorocarbon 123; FC-123; F-123

HFA-123; HCFC-123

Propellant 123; Refrigerant 123; R-123

Conversion factors:
1 ppm = 6.25 mg/m³ at 25º C
1 mg/m³ = 0.160 ppm at 25º C

1,1-Dichloro-2,2,2-trifluoroethane is a non-flammable, volatile, colorless liquid under ambient conditions and has a faint odour of ether. It is produced and used as a substitute for the fully halogenated chlorofluorocarbons with comparable physical properties since it has more favorable environmental properties.

Dichlorotrifluoroethane would not be considered to be readily biodegradable. Studies conducted in algae, Daphnia, and rainbow trout indicated a moderate level of toxicity to aquatic organisms. The octanol/water partition coefficient (Pow, = 2.0-2.8) is indicative of a low potential to bioaccumulate.