ICSC 0732 - alpha-METHYL STYRENE

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alpha-METHYL STYRENE	ICSC: 0732 (October 2005)
Isopropenyl benzene 2-Phenylpropene 1-Methyl-1-phenylethylene

CAS #: 98-83-9

UN #: 2303

EC Number: 202-705-0

	ACUTE HAZARDS	PREVENTION	FIRE FIGHTING
FIRE & EXPLOSION	Flammable. Above 54°C explosive vapour/air mixtures may be formed.	NO open flames, NO sparks and NO smoking. Above 54°C use a closed system, ventilation and explosion-proof electrical equipment.	Use water spray, foam, powder, carbon dioxide. In case of fire: keep drums, etc., cool by spraying with water.

PREVENT GENERATION OF MISTS!
	SYMPTOMS	PREVENTION	FIRST AID
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	CLASSIFICATION & 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.	According to UN GHS Criteria Transportation UN Classification UN Hazard Class: 3; UN Pack Group: III
STORAGE
Store only if stabilized. Store in an area without drain or sewer access. Fireproof. Well closed. Separated from strong oxidants.
PACKAGING
Marine pollutant.

alpha-METHYL STYRENE

ICSC: 0732

PHYSICAL & CHEMICAL INFORMATION
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.	Formula: C₉H₁₀ / C₆H₅C(CH₃)=CH₂ Molecular mass: 118.2 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

PHYSICAL & CHEMICAL INFORMATION

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.

Formula: C₉H₁₀ / C₆H₅C(CH₃)=CH₂
Molecular mass: 118.2
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

EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation. Effects of short-term exposure The substance is irritating to the eyes, skin and respiratory tract. Lachrymation.	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 long-term or repeated exposure Repeated or prolonged contact with skin may cause dermatitis.

EXPOSURE & HEALTH EFFECTS

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

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

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

OCCUPATIONAL EXPOSURE LIMITS
TLV: 10 ppm as TWA; A3 (confirmed animal carcinogen with unknown relevance to humans). MAK: 250 mg/m³, 50 ppm; peak limitation category: I(2); pregnancy risk group: D. EU-OEL: 246 mg/m³, 50 ppm as TWA; 492 mg/m³, 100 ppm as STEL

ENVIRONMENT
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

EC Classification
Symbol: Xi, N; R: 10-36/37-51/53; S: (2)-61

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