ICSC 0089 - ACETYLENE

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ACETYLENE	ICSC: 0089 (August 2003)
Ethine Ethyne

CAS #: 74-86-2

UN #: 1001

EC Number: 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	PREVENTION	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

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

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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