ICSC 0397 - cis-2-BUTENE

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cis-2-BUTENE	ICSC: 0397 (November 2019)
2-Butene, (Z)- cis-Dimethylethylene beta-cis-Butylene (Z)-but-2-ene

CAS #: 590-18-1

UN #: 1012

EC Number: 209-673-7

	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) if in liquid state. 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 water spray, dry powder, alcohol-resistant foam. In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.

See Notes.
	SYMPTOMS	PREVENTION	FIRST AID
Inhalation	Dizziness. Unconsciousness. Suffocation.	Use 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.	ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention .
Eyes	See Skin.	Wear face shield.	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
Evacuate danger area! Consult an expert! Personal protection: self-contained breathing apparatus. Remove all ignition sources. Shut off cylinder if possible. Ventilation. Isolate the area until the gas has dispersed. NEVER direct water jet on liquid.	According to UN GHS Criteria DANGER Extremely flammable gas Contains gas under pressure; may explode if heated Transportation UN Classification UN Hazard Class: 2.1
STORAGE
Fireproof. Store outside or in a separate well-ventilated building. Ventilation along the floor.
PACKAGING

cis-2-BUTENE

ICSC: 0397

PHYSICAL & CHEMICAL INFORMATION
Physical State; Appearance COLOURLESS COMPRESSED LIQUEFIED GAS. Physical dangers The gas is heavier than air and may travel along the ground; distant ignition possible. The gas is heavier than air and may accumulate in lowered spaces causing a deficiency of oxygen. As a result of flow, agitation, etc., electrostatic charges can be generated. Chemical dangers	Formula: C₄H₈ / CH₃-HC=CH-CH₃ Molecular mass: 56.1 Boiling point: 3.7°C Melting point: -138.7°C Density (at the boiling point of the liquid): 0.6 kg/l Solubility in water, mg/l at 25°C: 658 (very slightly soluble) Vapour pressure, kPa at 21°C: 181 Relative vapour density (air = 1): 1.9 Flash point: Flammable gas Auto-ignition temperature: 324°C Explosive limits, vol% in air: 1.7-9.7 Octanol/water partition coefficient as log Pow: 2.33

PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
COLOURLESS COMPRESSED LIQUEFIED GAS.

Physical dangers
The gas is heavier than air and may travel along the ground; distant ignition possible. The gas is heavier than air and may accumulate in lowered spaces causing a deficiency of oxygen. As a result of flow, agitation, etc., electrostatic charges can be generated.

Chemical dangers

Formula: C₄H₈ / CH₃-HC=CH-CH₃
Molecular mass: 56.1
Boiling point: 3.7°C
Melting point: -138.7°C
Density (at the boiling point of the liquid): 0.6 kg/l
Solubility in water, mg/l at 25°C: 658 (very slightly soluble)
Vapour pressure, kPa at 21°C: 181
Relative vapour density (air = 1): 1.9
Flash point: Flammable gas
Auto-ignition temperature: 324°C
Explosive limits, vol% in air: 1.7-9.7
Octanol/water partition coefficient as log Pow: 2.33

EXPOSURE & HEALTH EFFECTS
Routes of exposure Exposure mainly occurs via inhalation. Effects of short-term exposure Rapid evaporation of the liquid may cause frostbite. Exposure to high concentrations could cause asphyxiation. This may result in unconsciousness, respiratory arrest and death. See Notes.	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
Exposure mainly occurs via inhalation.

Effects of short-term exposure
Rapid evaporation of the liquid may cause frostbite. Exposure to high concentrations could cause asphyxiation. This may result in unconsciousness, respiratory arrest and death. See Notes.

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: 250 ppm as TWA

ENVIRONMENT

NOTES
Check oxygen content before entering area. Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. The recommendations on this Card also apply to trans-2-butene (ICSC 0398). Other CAS number: 107-01-7 (2-butene cis and trans).

ADDITIONAL INFORMATION

EC Classification
H220; H280

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