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

  • 1,2-Difluoro-1,1,2,2-tetrachloroethane
  • Freon 112
  • Halocarbon 112
  • Refrigerant 112
  • Tetrachloro-1,2-difluoroethane
  • Ethane, 1,1,2,2-Tetrachloro-1,2-difluoro
Formula
C2Cl4F2
Structure
Description
Colorless solid or liquid (above 77 degrees f). Slight camphor-like odor when concentrated.
Uses
Fully halogenated chlorofluorocarbons (cfcs) such as 1,1,2,2-tetrachloro-1,2-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
76-12-0
EC (EINECS/ELINCS)
200-935-6
RTECS
KI1420000
RTECS class
Tumorigen; Primary Irritant
UN (DOT)
1078
Beilstein/Gmelin
1740336
Beilstein Reference
4-01-00-00146
Swiss Giftliste 1
G-4615
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2Cl4F2
Formula mass
203.82
Boiling point, °C
93
Vapor pressure, mmHg
40 (20 C)
Vapor density (air=1)
7.03
Critical temperature
278
Density
1.655 g/cm3 (20 C)
Solubility in water
100 mg/L
Viscosity
1.21 cp (30 C)
Surface tension
22.73 g/s2 (30 C)
Refractive index
1.411 (25 C)
Partition coefficient, pKow
3.64
Heat of vaporization
32.64 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Employees should be provided with and required to use impervious clothing, gloves, face shields (8-in minimum), and other appropriate protective clothing necessary to prevent repeated or prolonged skin contact with liquid or solid. Employees should be provided with and required to use dust- and splash-proof safety goggles where liquid or solid may contact the eyes. Wear appropriate eye protection and protective clothing.
Respirators
Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive pressure mode. Any supplied-air respirator that has a full facepiece and is operated in pressure-demand or other positive pressure mode in combination with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive pressure mode. Any appropriate escape-type, self-contained breathing apparatus.
Small spills/leaks
Evacuate area and ventilate. Wear protective equipment. If required, use an inert absrobent. Sweep up and place in an appropriate container for disposal. Wash contaminated surfaces.
Stability
No data.
Incompatibilities
Reacts with chemically active metals such as sodium, potassium, beryllium, or with powdered aluminum, zinc, and magnesium.
Decomposition
When heated to decomposition it emits toxic fumes of flourides and chlorides. Toxic gases and vapors (such as hydrogen chloride, hydrogen fluoride, carbon monoxide) may be released when 1,1,2,2-tetrachloro-1,2-difluoroethane decomposes. Appearance of toxic decomposition products serves as warning of occurrence of thermal decomposition and detection of sharp acrid odor warns of presence.

Fire.
Flash Point,°C
12
Fire fighting
During firefighting wear self-contained breathing apparatus with full facepiece operated in pressure-demand or other positive pressure mode.
Fire potential
Tetrachlorodifluoroethane is not flammable.
Combustion products
All fluorocarbons will undergo thermal decomposition when exposed to flame or red-hot metal.

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
Nausea may develop. Ingestion of a small amount of trichlorofluoromethane resulted in necrosis and perforation of the stomach in one patient.
   Inhalation
Pulmonary irritation, bronchial constriction, cough, dyspnea, and chest tightness may develop after inhalation. Chronic pulmonary hyperreactivity may occur. Adult respiratory distress syndrome has been reported following acute inhalational exposures. Pulmonary edema is an autopsy finding in fatal cases.
   Skin
Dermal contact may result in defatting, irritation or contact dermatitis. Severe frostbite has been reported as an effect of freon exposure. Injection causes transient pain, erythema and edema.
   Eyes
EYES - Eye irritation occurs with ambient exposure. Frostbite of the lids may be severe. NOSE - Nasal irritation occurs with ambient exposure. THROAT - Irritation occurs. Frostbite of the lips, tongue, buccal mucosa and hard palate developed in a man after deliberate inhalation.

First aid
 
   Ingestion
These substances may cause frostbite to the upper airway and gastrointestinal tract after ingestion. Administer oxygen and manage airway as clinically indicated. Emesis, activated charcoal, and gastric lavage are not recommended.
   Inhalation
Provide a quiet calm atmosphere to prevent adrenaline surge if the patient is seen before the onset of cardiac arrhythmias. Minimize physical exertion.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. If frostbite has occurred, refer to dermal treatment in the main body of this document for rewarming.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. Ophthamologic consultation should be obtained in any symptomatic patients.

Transport.
UN number
1078
Response guide
36. Halogenated hydrocarbons