IPCS INCHEM Home
ISOBUTANE
(cylinder) 		ICSC: 0901
Peer-Review Status: 25.11.1998 Validated
2-Methylpropane
1,1-Dimethylethane
Trimethylmethane 
CAS #: 75-28-5 RTECS #: TZ4300000
UN #: 1969
EC #: 601-004-00-0
EINECS #: 200-857-2
 		    Formula: C4H10 / (CH3)2CHCH3
Molecular mass: 58.1

TYPES OF
HAZARD /
EXPOSURE 		ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Extremely flammable.  NO open flames, NO sparks and NO smoking.  Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out. In other cases extinguish with water spray. 
EXPLOSION Gas/air mixtures are explosive.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding) if in liquid state.  In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position. 
 
EXPOSURE      
Inhalation Shortness of breath. Suffocation.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin ON CONTACT WITH LIQUID: FROSTBITE.  Cold-insulating gloves. Protective clothing.  ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention . 
Eyes   Wear safety goggles or 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
 		PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. NEVER direct water jet on liquid. Personal protection: filter respirator for organic vapours of low boiling point adapted to the airborne concentration of the substance.   
EC Classification
Symbol: F+; R: 12; S: (2)-9-16; Note: C 
UN Classification
UN Hazard Class: 2.1 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-501.
NFPA Code: H1; F4; R0.  		Fireproof. 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. As a result of flow, agitation, etc., electrostatic charges can be generated. 

Chemical dangers
Reacts with strong oxidants, acetylene, halogens and nitrogen oxides. This generates fire and explosion hazard. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):.
MAK: 1000 ppm, 2400 mg/m³; Peak limitation category: II(4); Pregnancy risk group: D; (DFG 2008). 

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

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment. 

Effects of short-term exposure
Rapid evaporation of the liquid may cause frostbite. The substance may cause effects on the cardiovascular system. This may result in impaired functions and respiratory failure. Exposure at high levels could cause death. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: -12°C
Melting point: -160°C
Relative density (water = 1): 0.6 (liquid)
Solubility in water at 20°C: none
Vapour pressure, kPa at 20°C: 304
Relative vapour density (air = 1): 2
Flash point: Flammable gas
Auto-ignition temperature: 460°C
Explosive limits, vol% in air: 1.8-8.4
Octanol/water partition coefficient as log Pow: 2.8   		 

NOTES
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.
The measures mentioned in section PREVENTION are applicable to production, filling of cylinders, and storage of the gas.
Card has been partially updated in November 2008: see Occupational Exposure Limits. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety 		WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
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. 
    See Also:
       Toxicological Abbreviations