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OXYGEN DIFLUORIDE ICSC: 0818
Date of Peer Review: November 1998

Oxygen fluoride
Fluorine monoxide
Difluoride monoxide
(cylinder)
CAS # 7783-41-7 OF2
RTECS # RS2100000 Molecular mass: 54.0
UN # 2190
EC Index #
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 may be needed. 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 PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Gas-tight chemical protection suit including self-contained breathing apparatus.
EU Classification
UN Classification
UN Hazard Class: 2.3
UN Subsidiary Risks: 5.1 and 8

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20G1TOC
Fireproof. Separated from incompatible materials. See Chemical Dangers. Cool. Dry.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK
OXYGEN DIFLUORIDE ICSC: 0818
IMPORTANT DATA
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 250C 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 (Ceiling value); (ACGIH 2004).
MAK 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:
The substance is severely irritating to 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 the OEL may result in death. The effects may be delayed. Medical observation is indicated.

PHYSICAL PROPERTIES
Boiling point: -145C
Melting point: -224C
Solubility in water, ml/100 ml at 0C: 6.8 (reacts slowly)
Relative vapour density (air = 1): 1.8
ENVIRONMENTAL DATA

NOTES
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 inhalation therapy 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. Card has been partly updated in October 2005. See sections Occupational Exposure Limits, Emergency Response.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2005