International Chemical Safety Cards OXYGEN DIFLUORIDE ICSC: 0818 Oxygen fluoride Fluorine monoxide Difluoride monoxide OF2 Molecular mass: 54.0 (cylinder) ICSC #    0818 CAS #     7783-41-7 RTECS # RS2100000 UN #        2190 November 23, 1998 Peer reviewed TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/ FIRE FIGHTING FIRE Not combustible but enhances combustion of other substances. Many reactions may cause fire or explosion. In case of fire in the surroundings: in large fires: water spray; in small fires: powder. EXPLOSION Risk of fire and explosion. Mixture with water or water vapour explodes violently on spark ignition. In case of fire: cool cylinder by spraying with water but avoid contact of the substance with water. Combat fire from a sheltered position. EXPOSURE AVOID ALL CONTACT! IN ALL CASES CONSULT A DOCTOR!  •INHALATION Cough. Headache. Laboured breathing. Sore throat. Symptoms may be delayed (see Notes). Closed system and ventilation. Fresh air, rest. Half-upright position. 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 Redness. Pain. Loss of vision. Severe deep burns. 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 Do not eat, drink, or smoke during work. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Ventilation. Gas-tight chemical protection suit including self-contained breathing apparatus. Fireproof. Separated from incompatible materials (see Chemical Dangers). Cool. Dry. R: S: UN Hazard Class: 2.3 UN Subsidiary Risks: 5.1 and 8 SEE IMPORTANT INFORMATION ON BACK ICSC: 0818 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 OXYGEN DIFLUORIDE ICSC: 0818 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: COLOURLESS COMPRESSED GAS , WITH CHARACTERISTIC ODOUR. YELLOWISH-BROWN WHEN LIQUID. PHYSICAL DANGERS: The gas is heavier than air. CHEMICAL DANGERS: The substance decomposes on heating above 250°C producing toxic and corrosive gases. The substance is a strong oxidant and reacts violently with combustible and reducing materials. Reacts with non-metals such as red phosphorous, boron powder, and porous materials such as silica and alumina. Reacts explosively with hydrogen sulfide at ambient temperature, with chlorine, bromine or iodine on warming causing fire and explosion hazard. Explodes on contact with steam. OCCUPATIONAL EXPOSURE LIMITS: TLV: 0.05 ppm; 0.11 mg/m3 (as ceiling) (ACGIH 1997). MAK not established. OSHA PEL: TWA 0.05 ppm (0.1 mg/m3) NIOSH REL: C 0.05 ppm (0.1 mg/m3) NIOSH IDLH: 0.5 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: The substance severely irritates the eyes and the respiratory tract. Inhalation of this gas may cause lung oedema (see Notes). Rapid evaporation of the liquid may cause frostbite. Exposure slightly above OEL may result in death. The effects may be delayed. Medical observation is indicated. EFFECTS OF LONG-TERM OR REPEATED EXPOSURE: PHYSICAL PROPERTIES Boiling point: -145°C Melting point: -224°C Solubility in water, ml/100 ml at 0°C: 6.8 (reacts slowly) Relative vapour density (air = 1): 1.8 ENVIRONMENTAL DATA N O T E S Density of the liquid at boiling point: 1.90 kg/l. The occupational exposure limit value should not be exceeded during any part of the working exposure. 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. No odour warning if toxic concentrations are present. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. ADDITIONAL INFORMATION ICSC: 0818 OXYGEN DIFLUORIDE (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.