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ISOPENTANE
ICSC: 1153
Peer-Review Status: 22.04.1994 Validated
Ethyl dimethyl methane
2-Methylbutane
Isoamyl hydride 
CAS #: 78-78-4 RTECS #: EK4430000
UN #: 1265
EC #: 601-006-00-1
EINECS #: 201-142-8
    Formula: C5H12 / (CH3)2-CH-CH2-CH3
Molecular mass: 72.2

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Extremely flammable.  NO open flames, NO sparks and NO smoking.  Use powder, AFFF, foam, carbon dioxide. 
EXPLOSION Vapour/air mixtures are explosive.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Do NOT use compressed air for filling, discharging, or handling.  In case of fire: keep drums, etc., cool by spraying with water. 
 
EXPOSURE      
Inhalation Cough. Dizziness. Drowsiness. Headache. Shortness of breath. Sore throat. Irregular heartbeat.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Refer for medical attention. 
Skin Dry skin. Redness.  Protective gloves.  Remove contaminated clothes. Rinse skin with plenty of water or shower. 
Eyes Redness. Pain.  Wear safety spectacles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Nausea. Vomiting. Further see Inhalation.  Do not eat, drink, or smoke during work.  Rinse mouth. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT wash away into sewer.   
EC Classification
Symbol: F+, Xn, N; R: 12-51/53-65-66-67; S: (2)-9-16-29-33-61-62 
UN Classification
UN Hazard Class: 3; UN Pack Group: I 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30S1265 or 30GF1-I+II.
NFPA Code: H1; F4; R0. 
Fireproof. Well closed. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
The vapour 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
May explode on heating. 

Occupational exposure limits
TLV: 600ppm as TWA; (ACGIH 2004).
MAK: 1000 ppm, 3000 mg/m³; Peak limitation category: II(2); Pregnancy risk group: D; (DFG 2004). 

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

Inhalation risk
No indication can be given about the rate at which a harmful concentration of this substance in the air is reached on evaporation at 20°C. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. If this liquid is swallowed, aspiration into the lungs may result in chemical pneumonitis. The substance may cause effects on the central nervous system and heart. This may result in impaired functions. 

Effects of long-term or repeated exposure
The liquid defats the skin. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 28°C
Melting point: -160°C
Relative density (water = 1): 0.6
Solubility in water: none
Vapour pressure, kPa at 20°C: 79
Relative vapour density (air = 1): 2.5
Relative density of the vapour/air-mixture at 20°C (air = 1): 2.2
Flash point: <-51°C c.c.
Auto-ignition temperature: 420°C
Explosive limits, vol% in air: 1.4-7.6
Octanol/water partition coefficient as log Pow: 2.3  
The substance is harmful to aquatic organisms. 

NOTES
Use of alcoholic beverages enhances the harmful effect.
High concentrations in the air cause a deficiency of oxygen with the risk of unconsciousness or death.
Check oxygen content before entering area.
The relation between odour and the occupational exposure limit cannot be indicated.
Card has been partly updated in April 2005.
See sections Occupational Exposure Limits, EU classification, Emergency Response. 

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