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alpha-METHYL STYRENE ICSC: 0732
Date of Peer Review: October 2005

Isopropenyl benzene
2-Phenylpropene
1-Methyl-1-phenylethylene
CAS # 98-83-9 C9H10 / C6H5C(CH3)=CH2
RTECS # WL5075300 Molecular mass: 118.2
UN # 2303
EC Index # 601-027-00-6
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Flammable.
NO open flames, NO sparks, and NO smoking.
Water spray, foam, powder, carbon dioxide.
EXPLOSION Above 54C explosive vapour/air mixtures may be formed.
Above 54C 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.
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. Causes watering of the eyes.
Safety spectacles.
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.
Rinse mouth.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Personal protection: filter respirator for organic gases and vapours. 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 and remove to safe place.
Marine pollutant.
EU Classification
Symbol: Xi, N
R: 10-36/37-51/53
S: (2-)-61
UN Classification
UN Hazard Class: 3
UN Pack Group: III
EMERGENCY RESPONSE 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.
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 2005

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alpha-METHYL STYRENE ICSC: 0732
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR.

CHEMICAL DANGERS:
The substance may polymerize. The substance decomposes on burning producing 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/m; 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 20C; on spraying or dispersing, however, much faster.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes the skin and the respiratory tract. Lachrymation.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis.
PHYSICAL PROPERTIES
Boiling point: 164C
Melting point: -23C
Relative density (water = 1): 0.91
Solubility in water, g/100 ml at 20C: 0.012 (very poor)
Vapour pressure, Pa at 20C: 300
Relative vapour density (air = 1): 4.08
Relative density of the vapour/air-mixture at 20C (air = 1): 1.01
Flash point: 54C
Auto-ignition temperature: 574C
Explosive limits, vol% in air: 0.9-6.6
Octanol/water partition coefficient as log Pow: 3.38
ENVIRONMENTAL DATA
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


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 2005