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
1,1,2,2-Tetrachloro-1,2-difluoroethane | |
| |
| 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 |
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| 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 | 126 | |
| USCG Compatatibility Group | 36. Halogenated hydrocarbons | |