DICHLOROMONOFLUOROMETHANE ICSC: 1106 Fluorodichloromethane HCFC 21 Fluorocarbon 21 CHCl2F Molecular mass: 102.9 (cylinder) ICSC #    1106 CAS #     75-43-4 RTECS # PA8400000 UN #        1029 Types of Hazard/ Exposure Acute Hazards/ Symptoms Prevention First Aid/ Fire Fighting FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire. In case of fire in the surroundings: use appropriate extinguishing media. Explosion In case of fire: keep cylinder cool by spraying with water. Exposure  •Inhalation Confusion. Drowsiness. Unconsciousness. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.  •Skin ON CONTACT WITH LIQUID: FROSTBITE. Cold-insulating gloves. Protective clothing. ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.  •Eyes Safety goggles or eye protection in combination with breathing protection. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.  •Ingestion Do not eat, drink, or smoke during work. Spillage Disposal Storage Packaging & Labelling Ventilation. NEVER direct water jet on liquid. Do NOT let this chemical enter the environment. Personal protection: self-contained breathing apparatus. Fireproof if in building. UN Hazard Class: 2.2 DICHLOROMONOFLUOROMETHANE ICSC: 1106 Important Data Physical State; Appearance: COLOURLESS GAS OR COMPRESSED LIQUEFIED GAS , WITH CHARACTERISTIC ODOUR. Physical Dangers: The gas is heavier than air, and may accumulate in low ceiling spaces causing deficiency of oxygen. Chemical Dangers: The substance decomposes on heating producing corrosive and highly toxic fumes (hydrogen chloride - see ICSC 0163, hydrogen fluoride - see ICSC 0283, and phosgene - see ICSC 0007). Reacts with powdered aluminium, zinc and magnesium. Reacts with acids or acid fumes producing highly toxic fumes (chlorides, fluorides). Attacks some forms of plastic, rubber and coatings. Occupational Exposure Limits: TLV: 10 ppm as TWA; (ACGIH 2004). MAK: 10 ppm, 43 mg/m3 Peak limitation category: II(2); (DFG 2008). OSHA PEL: TWA 1000 ppm (4200 mg/m3) NIOSH REL: TWA 10 ppm (40 mg/m3) NIOSH IDLH: 5000 ppm See: 75434 Routes of Exposure: The substance can be absorbed into the body by inhalation. Inhalation Risk: A harmful concentration of this gas in the air will be reached very quickly on loss of containment. Effects of Short-Term Exposure: The liquid may cause frostbite. The substance may cause effects on the central nervous system at high concentrations. Exposure far above the OEL could cause cardiac dysrhythmia. Effects of Long-Term or Repeated Exposure: The substance may have effects on the liver. Physical Properties Boiling point: 8.9°C Melting point: -135°C Solubility in water: poor (1 g/100 ml at 20°C) Vapour pressure, kPa at 21°C: 159 Relative vapour density (air = 1): 3.8 Auto-ignition temperature: 522°C Octanol/water partition coefficient as log Pow: 1.55 Environmental Data This substance may be hazardous to the environment; special attention should be given to its impact on the ozone layer. N O T E S High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death. Check oxygen content before entering area. No odour warning if toxic concentrations are present. Do NOT use in the vicinity of a fire or a hot surface, or during welding. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Freon21, Genetron 21, Arcton 7 and Algofrene type 5 are trade names. Card has been partly updated in April 2005. See sections Emergency response, Occupational Exposure Limits. Transport Emergency Card: TEC (R)-20G2A ADDITIONAL INFORMATION ICSC: 1106 DICHLOROMONOFLUOROMETHANE (C) IPCS, CEC, 1994 IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.