International Chemical Safety Cards CHLORODIFLUOROETHANE ICSC: 0643 1-Chloro-1,1-difluoroethane HCFC 142 b C2H3ClF2 / CH3CClF2 Molecular mass: 100.5 (cylinder) ICSC #    0643 CAS #     75-68-3 RTECS # KH7650000 UN #        2517 November 26, 1998 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Extremely flammable. Gives off irritating or toxic fumes (or gases) in a fire. NO open flames, NO sparks, and NO smoking. Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with water spray. EXPLOSION Gas/air mixtures are explosive. Closed system, ventilation, explosion-proof electrical equipment and lighting. In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position. EXPOSURE  •INHALATION Drowsiness. Suffocation. (See Notes). Ventilation. Fresh air, rest. Artificial respiration if indicated. Refer for medical attention.  •SKIN ON CONTACT WITH LIQUID: FROSTBITE. Cold-insulating gloves. ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.  •EYES See Skin. 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 SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. NEVER direct water jet on liquid. (Extra personal protection: chemical protection suit including self-contained breathing apparatus). Fireproof. Cool. R: S: UN Hazard Class: 2.1 SEE IMPORTANT INFORMATION ON BACK ICSC: 0643 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards CHLORODIFLUOROETHANE ICSC: 0643 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS COMPRESSED LIQUEFIED GAS. PHYSICAL DANGERS: The gas is heavier than air and may travel along the ground; distant ignition possible, and may accumulate in low ceiling spaces causing deficiency of oxygen. CHEMICAL DANGERS: The substance decomposes on burning producing toxic and corrosive gases inclding hydrogen chloride and hydrogen fluoride. Reacts violently with oxidants causing fire hazard. OCCUPATIONAL EXPOSURE LIMITS: TLV not established. 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: Rapid evaporation of the liquid may cause frostbite. The substance may cause effects on the cardiovascular system. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: -9°C Melting point: -131°C Relative density (water = 1): 1.1 Solubility in water, g/100 ml at 25°C: 0.19 Vapour pressure, kPa at 25°C: 337 Relative vapour density (air = 1): 3.5 Flash point: Flammable Gas Auto-ignition temperature: 632°C Explosive limits, vol% in air: 6.2 - 17.9 Octanol/water partition coefficient as log Pow: 1.6 ENVIRONMENTAL DATA Avoid release to the environment in circumstances different to normal use. 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. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Freon 142B, Genetron 142B, Isotron 142B are trade names. Transport Emergency Card: TEC (R)-20G41 NFPA Code: H; F4; R0. ADDITIONAL INFORMATION ICSC: 0643 CHLORODIFLUOROETHANE (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.