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KETENE
ICSC: 0812
Peer-Review Status: 10.10.1997 Validated
Carbomethene
Ethenone
Ketoethylene 
CAS #: 463-51-4 RTECS #: OA7700000
EINECS #: 207-336-9
    Formula: C2H2O / CH2=C=O
Molecular mass: 42.0

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Extremely flammable.  NO open flames, NO sparks and NO smoking.  Use powder, carbon dioxide. NO water. 
EXPLOSION Gas/air mixtures are explosive.  Closed system, ventilation, explosion-proof electrical equipment and lighting.  In case of fire: keep cylinder cool by spraying with water. NO direct contact with water. 
 
EXPOSURE   STRICT HYGIENE!   
Inhalation Cough. Shortness of breath. Symptoms may be delayed. See Notes.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin Redness.  Protective gloves.  Remove contaminated clothes. Rinse skin with plenty of water or shower. 
Eyes Redness. Pain.  Wear 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 refer for medical attention. 
Ingestion      

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Personal protection: gas-tight chemical protection suit including self-contained breathing apparatus.   
EC Classification
 
UN Classification
 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
  The substance cannot be stored or shipped. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS GAS WITH CHARACTERISTIC ODOUR. 

Physical dangers
The gas is heavier than air and may travel along the ground; distant ignition possible. 

Chemical dangers
The substance may readily polymerize. Reacts violently with many organic compounds. Reacts with water. This produces acetic acid. Decomposes in alcohol and ammonia. 

Occupational exposure limits
TLV: 0.5 ppm, 0.86 mg/m³ as TWA; 1.5 ppm, 2.6 mg/m³ as STEL; (ACGIH 1997). 

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 irritating to the eyes, skin and respiratory tract. Inhalation of of this gas may cause lung oedema. The effects may be delayed. Medical observation is indicated. See Notes. 

Effects of long-term or repeated exposure
Repeated or prolonged inhalation may cause effects on the lungs. This may result in emphesema and fibrosis. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: -56°C
Melting point: -150°C
Solubility in water: reaction
Relative vapour density (air = 1): 1.4
Flash point: Flammable gas 
 

NOTES
Reacts violently with fire extinguishing agents such as water.
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. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.
    See Also:
       Toxicological Abbreviations