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ACETYLENEICSC: 0089
August 2003
CAS #: 74-86-2Ethine
Ethyne
UN #: 1001
EINECS #: 200-816-9

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Extremely flammable.  Gas/air mixtures are explosive.  NO open flames, NO sparks and NO smoking.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Use non-sparking handtools. Flame arrester to prevent flash-back from burner to cylinder.  Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out. In other cases extinguish with powder, carbon dioxide.  In case of fire: keep cylinder cool by spraying with water. 

   
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Dizziness. Lethargy. Headache. Suffocation.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Artificial respiration may be needed. Refer for medical attention. 
Skin      
Eyes     First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion   Do not eat, drink, or smoke during work.   

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Remove all ignition sources. Evacuate danger area! Consult an expert! Personal protection: self-contained breathing apparatus. Ventilation. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 2.1 

STORAGE
Fireproof. See Chemical Dangers. Cool. 
PACKAGING
Special insulated cylinder. 
ACETYLENE ICSC: 0089
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS GAS DISSOLVED IN ACETONE UNDER PRESSURE. 

Physical dangers
The gas mixes well with air, explosive mixtures are easily formed. 

Chemical dangers
The substance may polymerize. Decomposes on heating and increasing pressure. This generates fire and explosion hazard. The substance is a strong reducing agent. It reacts violently with oxidants and fluorine or chlorine under influence of light. This generates fire and explosion hazard. Reacts with copper, silver, mercury and their salts. This produces shock-sensitive compounds (acetylides). 

Formula: C2H2
Molecular mass: 26.0
Sublimation point: -84°C
Solubility in water, g/100ml at 20°C: 0.12
Vapour pressure, kPa at 20°C: 4460
Relative vapour density (air = 1): 0.907
Flash point: Flammable gas
Auto-ignition temperature: 305°C
Explosive limits, vol% in air: 2.5-100
Octanol/water partition coefficient as log Pow: 0.37  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Effects of short-term exposure
Asphyxiation. 

Inhalation risk
On loss of containment this substance can cause suffocation by lowering the oxygen content of the air in confined areas. 

Effects of long-term or repeated exposure
 


Occupational exposure limits
TLV 

ENVIRONMENT
 

NOTES
Piping material for this gas must not contain over 63% of copper.
Check oxygen content before entering area.
After use for welding, turn valve off; regularly check tubing, etc., and test for leaks with soap and water.
The technical product may contain impurities which alter the health effects; for further information see ICSC0694 Phosphine. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: F+; R: 5-6-12; S: (2)-9-16-33 

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    See Also:
       Toxicological Abbreviations