International Chemical Safety Cards SELENIUM HEXAFLUORIDE ICSC: 0947 Selenium fluoride SeF6 Molecular mass: 193.0 (cylinder) Date of PeerH217 S. Czerczak ICSC #    0947 CAS #     7783-79-1 RTECS # VS9450000 UN #        2194 EC #         034-002-00-8 October 03, 2000 Peer reviewed 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: all extinguishing agents allowed. EXPLOSION In case of fire: keep drums, etc., cool by spraying with water. EXPOSURE STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR!  •INHALATION Corrosive. Cough. Sore throat. Headache. Nausea. Shortness of breath. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention.  •SKIN Redness. Pain. ON CONTACT WITH LIQUID: FROSTBITE. Protective gloves. Cold-insulating gloves. ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Rinse skin with plenty of water or shower. Refer for medical attention.  •EYES Corrosive. Redness. Pain. Blurred vision. Face shield, 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. NEVER direct water jet on liquid. Gas-tight chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Fireproof if in building. Cool. Ventilation along the floor. Separated from food and feedstuffs . Note: A T symbol N symbol R: 23/25-33-50/53 S: 1/2-20/21-28-45-60-61 UN Hazard Class: 2.3 UN Subsidiary Risks: 8 SEE IMPORTANT INFORMATION ON BACK ICSC: 0947 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 SELENIUM HEXAFLUORIDE ICSC: 0947 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS COMPRESSED LIQUEFIED GAS PHYSICAL DANGERS: CHEMICAL DANGERS: The substance decomposes on heating producing toxic and corrosive fumes including hydrogen fluoride and selenium. OCCUPATIONAL EXPOSURE LIMITS: TLV (as Se): 0.05 ppm; (ACGIH 2000). OSHA PEL: TWA 0.05 ppm (0.4 mg/m3) NIOSH REL: TWA 0.05 ppm NIOSH IDLH: 2 ppm 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: Corrosive. The substance is corrosive to the eyes and the respiratory tract. Inhalation of the gas may cause lung oedema (see Notes). Rapid evaporation of the liquid may cause frostbite. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: -34.5°C Sublimation point: -46°C Melting point: -39°C Solubility in water: slow reaction Relative vapour density (air = 1): 6.7 ENVIRONMENTAL DATA The substance is harmful to aquatic organisms. N O T E S The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation is therefore essential. Immediate administration of an appropriate spray, by a doctor or a person authorized by him/her, should be considered. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Transport Emergency Card: TEC (R)-20G44 ADDITIONAL INFORMATION ICSC: 0947 SELENIUM HEXAFLUORIDE (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.