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 April 18, 2007 Validated 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. Heating will cause rise in pressure with risk of bursting. 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!  •INHALATION Cough. Headache. Laboured breathing. Sore throat. Closed system and ventilation. Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer immediately for medical attention.  •SKIN See Notes. Remove contaminated clothes.  •EYES Causes watering of the eyes. Safety goggles or eye protection in combination with breathing protection. First rinse with plenty of water (remove contact lenses if easily possible). Refer for medical attention.  •INGESTION Do not eat, drink, or smoke during work. SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Ventilation. Personal protection: gas-tight chemical protection suit including self-contained breathing apparatus. Fireproof. Keep in a well-ventilated room. Separated from incompatible materials . See Chemical Dangers. Cool. Dry. UN Hazard Class: 2.3 UN Subsidiary Risks: 5.1 and 8 Signal: Danger Flam circle-Cylinder-Skull May cause or intensify fire; oxidizer Contains gas under pressure; may explode if heated Fatal if inhaled gas 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. PHYSICAL DANGERS: The gas is heavier than air. CHEMICAL DANGERS: The substance is a strong oxidant and reacts violently with combustible and reducing materials. Reacts with many materials e.g. non-metals such as red phosphorous, boron powder, and porous materials such as silica, alumina and charcoal. Explodes on contact with steam. OCCUPATIONAL EXPOSURE LIMITS: TLV: 0.05 ppm (Ceiling value); (ACGIH 2006). 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 See: 7783417 ROUTES OF EXPOSURE: The substance can be absorbed into the body in hazardous amounts 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: Lachrymation. The substance is irritating to the respiratory tract . Inhalation of this gas may cause lung oedema (see Notes). Exposure slightly above the OEL may result in death. 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): 1.9 ENVIRONMENTAL DATA N O T E S Do NOT take working clothes home. 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 inhalation therapy by a doctor or a person authorized by him/her, should be considered. Transport Emergency Card: TEC (R)-20G1TOC 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.