International Chemical Safety Cards ACETYLENE ICSC: 0089 Ethine Ethyne C2H2 Molecular mass: 26.0 (cylinder) ICSC #    0089 CAS #     74-86-2 RTECS # AO9600000 UN #        1001 EC #         601-015-00-0 May 08, 2003 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Extremely flammable. 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 powder, carbon dioxide. EXPLOSION Gas/air mixtures are explosive. Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Use non-sparking handtools. Use flame arrester to prevent flash-back from burner to cylinder. In case of fire: keep cylinder cool by spraying with water. EXPOSURE  •INHALATION Dizziness. Dullness. Headache. Suffocation. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.  •SKIN  •EYES 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 Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. (Extra personal protection: self-contained breathing apparatus). Fireproof. Separated from - see Chemical Dangers. Cool. Special insulated cylinder. F+ symbol R: 5-6-12 S: 2-9-16-33 UN Hazard Class: 2.1 SEE IMPORTANT INFORMATION ON BACK ICSC: 0089 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 ACETYLENE ICSC: 0089 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS GAS DISSOLVED IN ACETONE UNDER PRESSURE. PHYSICAL DANGERS: The gas mixes well with air, explosive mixtures are formed easily. CHEMICAL DANGERS: The substance may polymerize due to heating. The substance decomposes on heating and increasing pressure , causing fire and explosion hazard. The substance is a strong reducing agent and reacts violently with oxidants and with fluorine or chlorine under influence of light, causing fire and explosion hazard. Reacts with copper, silver, and mercury or their salts, forming shock-sensitive compounds (acetylides). OCCUPATIONAL EXPOSURE LIMITS: TLV: Simple asphyxiant, (ACGIH 2003). MAK not established. OSHA PEL: none NIOSH REL: C 2500 ppm (2662 mg/m3) NIOSH IDLH: No data ROUTES OF EXPOSURE: The substance can be absorbed into the body by inhalation. INHALATION RISK: On loss of containment this gas can cause suffocation by lowering the oxygen content of the air in confined areas. EFFECTS OF SHORT-TERM EXPOSURE: Suffocation. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: -85°C Melting point: -81°C Solubility in water, g/100 ml at 20°C: 0.12 Vapour pressure, kPa at 20°C: 4460 Relative vapour density (air = 1): 0.907 Flash point: Flammable Gas Auto-ignition temperature: 305°C Explosive limits, vol% in air: 2.5-100 Octanol/water partition coefficient as log Pow: 0.37 ENVIRONMENTAL DATA N O T E S Piping material for this gas must not contain over 63% of copper. Check oxygen content before entering area. After use for welding, turn valve off; regularly check tubing, etc., and test for leaks with soap and water. The technical product may contain impurities which alter the health effects; for further information see ICSC0694 Phosphine. Transport Emergency Card: TEC (R)-20S1001 NFPA Code: H 1; F 4; R 3; ADDITIONAL INFORMATION ICSC: 0089 ACETYLENE (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.