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NIOSH

alpha-METHYL STYRENE

ICSC: 0732

Isopropenyl benzene
2-Phenylpropene
1-Methyl-1-phenylethylene
C9H10 / C6H5C(CH3)=CH2
Molecular mass: 118.2
ICSC # 0732 		CAS # 98-83-9
RTECS # WL5075300
UN # 2303
EC # 601-027-00-6
October 20, 2005 Validated

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 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.
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

STORAGE

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.
Store only if stabilized. Store in an area without drain or sewer access. Fireproof. Well closed. Separated from strong oxidants.

Marine pollutant.
Xi symbol
N symbol
R: 10-36/37-51/53
S: 2-61
UN Hazard Class: 3
UN Packing Group: III
ICSC: 0732 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

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:


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/m3;
Peak limitation category: I(2);) Pregnancy risk group: D;
(DFG 2005).
OSHA PEL†: C 100 ppm (480 mg/m3)
NIOSH REL: TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)
NIOSH IDLH: 700 ppm See: 98839


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 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: 164°C
Melting point: -23°C
Relative density (water = 1): 0.91
Solubility in water, g/100 ml 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

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.

N O T E S

Transport Emergency Card: TEC (R)-30S2303 or 30GF1-III

NFPA Code: H1; F2; R1;

ADDITIONAL INFORMATION



ICSC: 0732 alpha-METHYL STYRENE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, 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. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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