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iso-Butene

i-C4H8

CAS:115-11-7



ISOBUTENE ICSC: 1027

Isobutylene 
2-Methylpropene 
1,1-Dimethylethylene 
(cylinder) 
CAS # 115-11-7 C4H8 / CH2=C(CH3)2
RTECS # UD0890000 Molecular mass: 56.1
UN # 1055
EC # 601-012-00-4
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. 
EU Classification 
Symbol: F+
R: 12
S: (2-)9-16-33
Note: C
UN Classification 
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. 
IPCS 
International 
Programme on 
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities � IPCS, CEC 2001 

SEE IMPORTANT INFORMATION ON BACK



ISOBUTENE ICSC: 1027
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
Boiling point: -6.9℃
Melting point: -140.3℃
Relative density (water = 1): 0.59
Solubility in water, g/100 ml at 20℃: 0.03
Vapour pressure, kPa at 20℃: 257
Relative vapour density (air = 1): 1.94
Flash point: -76.1℃ c.c. 
Auto-ignition temperature: 465℃
Explosive limits, vol% in air: 1.8-9.6
Octanol/water partition coefficient as log Pow: 2.35
ENVIRONMENTAL DATA

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. 
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
� IPCS, CEC 2001
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