ICSC 1027 - ISOBUTENE

[List of Chemicals] [Risk Notes] [Risk Phrases] [Safety Phrases] [Danger Symbols]

ISOBUTENE

ICSC: 1027
_{April 2000}

Isobutylene
2-Methylpropene
1,1-Dimethylethylene

CAS No: 115-11-7
RTECS No: UD0890000
UN No: 1055
EC No: 601-012-00-4

(cylinder)
C₄H₈ / CH₂=C(CH₃)₂
Molecular mass: 56.1

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	FIRST AID / FIRE FIGHTING
FIRE	Extremely flammable.	NO open flames, NO sparks, and NO smoking. NO contact with oxidizing materials.	Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with water spray, powder, carbon dioxide.
EXPLOSION	Gas/air mixtures are explosive. Risk of fire and explosion on contact with oxidants, halogens (see Chemical Dangers).	Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Use non-sparking handtools.	In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position.

EXPOSURE
Inhalation	Dizziness. Drowsiness. Dullness. Nausea. Unconsciousness. Vomiting.	Closed system and ventilation.	Fresh air, rest. Artificial respiration if indicated. 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.	Face shield or eye protection in combination with breathing protection.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion		Do not eat, drink, or smoke during work.

SPILLAGE DISPOSAL	PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. Do NOT wash away into sewer. NEVER direct water jet on liquid. Chemical protection suit including self-contained breathing apparatus.	F+ Symbol R: 12 S: (2-)9-16-33 Note: C UN Hazard Class: 2.1

EMERGENCY RESPONSE	STORAGE
Transport Emergency Card: TEC (R)-502 NFPA Code: H 1; F 4; R 0	Fireproof. Separated from incompatible materials (see Chemical Dangers). Cool.

IMPORTANT DATA

Physical State; Appearance
COLOURLESS COMPRESSED LIQUEFIED GAS, WITH CHARACTERISTIC ODOUR.

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

Chemical dangers
Reacts violently with halogens, oxidants, strong acids causing fire and explosion hazard.

Occupational exposure limits
TLV not established.
MAK not established.

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

Inhalation risk
On loss of containment this liquid evaporates very quickly causing supersaturation of the air with serious risk of suffocation when in confined areas.

Effects of short-term exposure
Rapid evaporation of the liquid may cause frostbite. The substance may cause effects on the central nervous system. Exposure at high levels may result in unconsciousness.

PHYSICAL PROPERTIES	ENVIRONMENTAL DATA
Boiling point: -6.9°C Melting point: -140.3°C Relative density (water = 1): 0.59 Solubility in water, g/100 ml at 20°C: 0.03 Vapour pressure, kPa at 20°C: 257 Relative vapour density (air = 1): 1.94 Flash point: -76.1°C c.c. Auto-ignition temperature: 465°C Explosive limits, vol% in air: 1.8-9.6 Octanol/water partition coefficient as log Pow: 2.35

NOTES

Density of the liquid at boiling point: 0.605 kg/l.
High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death.
Check oxygen content before entering area.
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2000

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.

Updated by AS. Approved by EC. Last update: 10.10.2000