International Chemical Safety Cards

alpha-METHYL STYRENE ICSC: 0732

alpha-METHYL STYRENE
Isopropenyl benzene
2-Phenylpropene
1-Methyl-1-phenylethylene
C9H10 / C6H5C(CH3)=CH2
Molecular mass: 118.2
CAS # 98-83-9
RTECS # WL5075300
ICSC # 0732
UN # 2303
EC # 601-027-00-6
TYPES OF
HAZARD/
EXPOSURE 		ACUTE HAZARDS/
SYMPTOMS 		PREVENTION FIRST AID/
FIRE FIGHTING
FIRE Combustible.
NO open flames.
Powder, water spray, foam, 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! STRICT HYGIENE!

INHALATION Cough. Dizziness. Sore throat.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
SKIN Redness.
Protective gloves.
Remove contaminated clothes. Rinse and then wash skin with water and soap.
EYES Redness.
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. Rest.
SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING
Ventilation. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place (extra personal protection: self-contained breathing apparatus).
Separated from strong oxidants. Well closed. Store only if stabilized.

Xi symbol
R: 10-36/37
S: (2)
UN Hazard Class: 3
UN Packing Group: III
Marine pollutant.
SEE IMPORTANT INFORMATION ON BACK
ICSC: 0732 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

International Chemical Safety Cards

alpha-METHYL STYRENE ICSC: 0732

I

M

P

O

R

T

A

N

T



D

A

T

A
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.

CHEMICAL DANGERS:
The substance may polymerize. The substance decomposes on heating producing carbon monoxide. Reacts with strong oxidants.

OCCUPATIONAL EXPOSURE LIMITS (OELs):
TLV: 50 ppm; 242 mg/m3 (as TWA); 100 ppm; 483 mg/m3 (as STEL) (ACGIH 1996).


ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes, the skin and the respiratory tract.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis. Repeated or prolonged contact may cause skin sensitization. The substance may have effects on the central nervous system, kidneys and liver.
PHYSICAL
PROPERTIES
 Boiling point: 164°C
Melting point: -23°C
Relative density (water = 1): 0.91
Solubility in water: none
Vapour pressure, Pa at 20°C: 29
Relative vapour density (air = 1): 4.08
 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.88
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: 3.380
ENVIRONMENTAL
DATA
N O T E S
NFPA Code: H2; F2; R2;
ADDITIONAL INFORMATION


ICSC: 0732 alpha-METHYL STYRENE
© IPCS, CEC, 1993
IMPORTANT LEGAL NOTICE: Neither the CEC or 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. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use.