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alpha-METHYL STYRENE
ICSC: 0732
Peer-Review Status: 20.10.2005 Validated
Isopropenyl benzene
2-Phenylpropene
1-Methyl-1-phenylethylene 
CAS #: 98-83-9 RTECS #: WL5075300
UN #: 2303
EC #: 601-027-00-6
EINECS #: 202-705-0
    Formula: C9H10 / C6H5C(CH3)=CH2
Molecular mass: 118.2

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Flammable.  NO open flames, NO sparks and NO smoking.  Use water spray, foam, powder, carbon dioxide. 
EXPLOSION Above 54°C explosive vapour/air mixtures may be formed.  Above 54°C use a closed system, ventilation and explosion-proof electrical equipment.  In case of fire: keep drums, etc., cool by spraying with water. 
 
EXPOSURE   PREVENT GENERATION OF MISTS!   
Inhalation Cough. Dizziness. Sore throat.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. 
Skin Redness.  Protective gloves.  Remove contaminated clothes. Rinse and then wash skin with water and soap. 
Eyes Redness. Watering of the eyes.  Wear safety spectacles.  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.  Rinse mouth. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: filter respirator for organic gases and vapours adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Ventilation. Collect leaking and spilled liquid in sealable non-metallic containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.  Marine pollutant. 
EC Classification
Symbol: Xi, N; R: 10-36/37-51/53; S: (2)-61 
UN Classification
UN Hazard Class: 3; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30S2303 or 30GF1-III.
NFPA Code: H1; F2; R1. 
Store only if stabilized. Store in an area without drain or sewer access. Fireproof. Well closed. Separated from strong oxidants. 

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

Physical dangers
 

Chemical dangers
The substance may polymerize. Decomposes on burning. This produces toxic fumes. Reacts with strong oxidants. Attacks aluminium and copper. 

Occupational exposure limits
TLV: 50 ppm as TWA; 100 ppm as STEL; (ACGIH 2005).
MAK: 50 ppm, 250 mg/m³; Peak limitation category: I(2); Pregnancy risk group: D; (DFG 2005). 

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

Inhalation risk
A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C; on spraying or dispersing, however, much faster. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. Lachrymation. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 164°C
Melting point: -23°C
Relative density (water = 1): 0.91
Solubility in water, g/100ml at 20°C: 0.012 (very poor)
Vapour pressure, Pa at 20°C: 300
Relative vapour density (air = 1): 4.08
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01
Flash point: 54°C
Auto-ignition temperature: 574°C
Explosive limits, vol% in air: 0.9-6.6
Octanol/water partition coefficient as log Pow: 3.38  
The substance is harmful to aquatic organisms. The substance may cause long-term effects in the aquatic environment. Bioaccumulation of this chemical may occur in fish. 

NOTES
 

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