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.
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
36. Halogenated hydrocarbons