1,1,1,2-Tetrachloro-2,2-difluoroethane
- 2,2-Difluoro-1,1,1,2-tetrachloroethane
- Freon 112a
- Halocarbon 112a
- Refrigerant 112a
1,1,1,2-Tetrachloro-2,2-difluoroethane | |
| |
| 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 | |