Ethine
Ethyne
C2H2
Molecular mass: 26.0
(cylinder)
ICSC # 0089
CAS # 74-86-2
RTECS # AO9600000
UN # 1001
EC # 601-015-00-0
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Extremely flammable.
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NO open flames, NO sparks, and NO smoking.
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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.
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Explosion
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Gas/air mixtures are explosive.
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Closed system, ventilation, explosion-proof electrical equipment and lighting.
Prevent build-up of electrostatic charges (e.g., by grounding).
Use non-sparking handtools.
Use flame arrester to prevent flash-back from burner to cylinder.
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In case of fire: keep cylinder cool by spraying with water.
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Exposure
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•Inhalation
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Dizziness.
Dullness.
Headache.
Suffocation.
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Ventilation, local exhaust, or breathing protection.
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Fresh air, rest.
Artificial respiration may be needed.
Refer for medical attention.
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•Skin
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•Eyes
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Do not eat, drink, or smoke during work.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Evacuate danger area!
Consult an expert!
Ventilation.
Remove all ignition sources.
(Extra personal protection: self-contained breathing apparatus).
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Fireproof.
Separated from -
see Chemical Dangers.
Cool.
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Special insulated cylinder.
F+ symbol
R: 5-6-12
S: 2-9-16-33
UN Hazard Class: 2.1
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Important Data
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Physical State; Appearance:
COLOURLESS
GAS DISSOLVED IN ACETONE UNDER PRESSURE.
Physical Dangers:
The gas mixes well with air, explosive mixtures are formed easily.
Chemical Dangers:
The substance may polymerize
due to heating.
The substance decomposes
on heating and increasing pressure
, causing fire and explosion hazard.
The substance is a strong reducing agent and reacts violently with oxidants and with fluorine or chlorine under influence of light,
causing fire and explosion hazard.
Reacts with copper, silver, and mercury or their salts, forming shock-sensitive compounds (acetylides).
Occupational Exposure Limits:
TLV: Simple asphyxiant, (ACGIH 2003).
MAK not established.
OSHA PEL: none
NIOSH REL: C 2500 ppm (2662 mg/m3)
NIOSH IDLH: N.D. See: IDLH INDEX
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation.
Inhalation Risk:
On loss of containment this gas can cause suffocation by lowering the oxygen content of the air in confined areas.
Effects of Short-Term Exposure:
Suffocation.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Boiling point: -85°C
Melting point: -81°C
Solubility in water, g/100 ml at 20°C: 0.12
Vapour pressure, kPa at 20°C: 4460
Relative vapour density (air = 1): 0.907
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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
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Environmental
Data
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N O T E S
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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.
Transport Emergency Card: TEC (R)-20S1001
NFPA Code: H 1; F 4; R 3;
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ADDITIONAL INFORMATION
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ICSC: 0089
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ACETYLENE
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(C) IPCS, CEC, 1994
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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.
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