1,1,1,2-Tetrachloro-2,2-difluoroethane

  • 2,2-Difluoro-1,1,1,2-tetrachloroethane
  • Freon 112a
  • Halocarbon 112a
  • Refrigerant 112a
Formula C2Cl4F2
Structure
Description Colorless liquid or solid. Slight ether odor.
Uses Fully halogenated chlorofluorocarbons (cfcs) such as 1,1,1,2-tetrachloro-2,2-difluoromethane were scheduled for production phase-out in 1987 by the montreal protocol. Although originally scheduled for 50% production phase-out by the year 2000 in developed countries, the worsening ozone depletion has forced acceleration of the cfc phase-out.

Registry Numbers and Inventories.
CAS 76-11-9
EC (EINECS/ELINCS) 200-934-0
RTECS KI1425000
RTECS class Other
UN (DOT) 1078
Beilstein/Gmelin 1699461
Beilstein Reference 4-01-00-00146
Swiss Giftliste 1 G-4616
Canada DSL/NDSL NDSL
US TSCA Listed
Austrailia AICS Listed
New Zealand Listed
Japan ENCS (MITI) Listed

Properties.
Formula C2Cl4F2
Formula mass 203.82
Boiling point, °C 91
Vapor pressure, mmHg 60 (25 C)
Vapor density (air=1) 7.0
Critical temperature 279
Critical pressure 33.0
Density 1.65 g/cm3 (41 C)
Solubility in water 0.1 g/L
Viscosity 2.1583x10-3 pa.s @ 313.75 K
Surface tension 2.7913x10-2 n/m @ 313.75 K
Partition coefficient, pKow 3.50
Heat of vaporization 34.8 kJ/mol

Hazards and Protection.
Storage Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation.
Protection Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability Stable under normal shipping and handling conditions. Stable under normal temperatures and pressures.
Incompatibilities Strong acids, strong bases, strong oxidizing agents.
Decomposition Hydrogen chloride, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, hydrogen fluoride.

Fire.
Flash Point,°C 12
Fire fighting Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential Tetrachlorodifluoroethane is not flammable.
Combustion products All fluorocarbons will undergo thermal decomposition when exposed to flame or red-hot metal.
NFPA Health 1
  Flammability 0  
  Reactivity 0  

Health.
Exposure limit(s) NIOSH REL: TWA 500 ppm (4170 mg/m3) OSHA PEL: TWA 500 ppm (4170 mg/m3) IDLH 2000 ppm
Poison_Class 5
Exposure effects Headache, dizziness, and disorientation are common. Cerebral edema may be found on autopsy. Dichlorodifluoromethane was not teratogenic in rats and rabbits. <br>The reproductive effects of 1,1,1,2-tetrafluoroethane were studied in rats. No adverse effects on reproductive performance was noted or on the development, maturation or reproductive performance of up to two successive generations.
   Ingestion May cause irritation of the digestive tract.
   Inhalation Vapor reduces oxygen available for breathing. May cause respiratory tract irritation.
   Skin May cause skin irritation.
   Eyes May cause eye irritation.

First aid
 
   Ingestion Never give anything by mouth to an unconscious person. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. Wash mouth out with water. Get medical aid if irritation or symptoms occur.
   Inhalation Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
   Skin Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. If irritation develops, get medical aid.

Transport.
UN number 1078
Response guide 126
USCG Compatatibility Group 36. Halogenated hydrocarbons