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DICHLOROMONOFLUOROMETHANE ICSC: 1106
Date of Peer Review: October 1999

Fluorodichloromethane
HCFC 21
Fluorocarbon 21
(cylinder)
CAS # 75-43-4 CHCl2F
RTECS # PA8400000 Molecular mass: 102.9
UN # 1029
EC #
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: use appropriate extinguishing media.
EXPLOSION

In case of fire: keep cylinder cool by spraying with water.
EXPOSURE


Inhalation Confusion. Drowsiness. Unconsciousness.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.
Skin ON CONTACT WITH LIQUID: FROSTBITE.
Cold-insulating gloves. Protective clothing.
ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.
Eyes
Safety goggles 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
Ventilation. NEVER direct water jet on liquid. Do NOT let this chemical enter the environment. Personal protection: self-contained breathing apparatus.
EU Classification
UN Classification
UN Hazard Class: 2.2

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-20G2A
Fireproof if in building.
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 2004

SEE IMPORTANT INFORMATION ON BACK


DICHLOROMONOFLUOROMETHANE ICSC: 1106
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS GAS OR COMPRESSED LIQUEFIED GAS, WITH CHARACTERISTIC ODOUR.

PHYSICAL DANGERS:
The gas is heavier than air, and may accumulate in low ceiling spaces causing deficiency of oxygen.

CHEMICAL DANGERS:
The substance decomposes on heating producing corrosive and highly toxic fumes (hydrogen chloride - see ICSC 0163, hydrogen fluoride - see ICSC 0283, and phosgene - see ICSC 0007). Reacts with powdered aluminium, zinc and magnesium. Reacts with acids or acid fumes producing highly toxic fumes (chlorides, fluorides). Attacks some forms of plastic, rubber and coatings.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 10 ppm as TWA; (ACGIH 2004).
MAK: 10 ppm, 43 mg/m; Peak limitation category: II(2); (DFG 2004).
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 liquid may cause frostbite. The substance may cause effects on the central nervous system at high concentrations. Exposure far above the OEL could cause cardiac dysrhythmia.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The substance may have effects on the liver.
PHYSICAL PROPERTIES
Boiling point: 8.9C
Melting point: -135C
Solubility in water: poor (1 g/100 ml at 20C)
Vapour pressure, kPa at 21C: 159
Relative vapour density (air = 1): 3.8
Auto-ignition temperature: 522C
Octanol/water partition coefficient as log Pow: 1.55
ENVIRONMENTAL DATA
This substance may be hazardous to the environment; special attention should be given to its impact on the ozone layer.
NOTES
High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death. Check oxygen content before entering area. No odour warning if toxic concentrations are present. Do NOT use in the vicinity of a fire or a hot surface, or during welding. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. Freon21, Genetron 21, Arcton 7 and Algofrene type 5 are trade names.
Card has been partly updated in April 2005. See sections Emergency response, Occupational Exposure Limits.
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 2004