ICSC: 0073
Peer-Review Status: 04.04.2006 Validated
CAS #: 100-42-5 RTECS #: WL3675000
UN #: 2055
EC #: 601-026-00-0
EINECS #: 202-851-5
    Formula: C8H8 / C6H5CHCH2
Molecular mass: 104.2

FIRE Flammable. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames, NO sparks and NO smoking.  Use dry powder. Use foam. Use carbon dioxide. 
EXPLOSION Above 31°C explosive vapour/air mixtures may be formed. See Notes.  Above 31°C use a closed system, ventilation and explosion-proof electrical equipment.  In case of fire: keep drums, etc., cool by spraying with water. 
Inhalation Dizziness. Drowsiness. Headache. Nausea. Vomiting. Weakness. Unconciousness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Pain.  Protective clothing. Protective gloves.  Remove contaminated clothes. Rinse and then wash skin with water and soap. 
Eyes Redness. Pain.  Wear safety goggles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Nausea. Vomiting.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Rest. 

Personal protection: chemical protection suit including self-contained breathing apparatus. Remove all ignition sources. Do NOT let this chemical enter the environment. Do NOT wash away into sewer. Collect leaking and spilled liquid in covered containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.  Airtight.
Marine pollutant. 
EC Classification
Symbol: Xn; R: 10-20-36/38; S: (2)-23; Note: D 
UN Classification
UN Hazard Class: 3; UN Pack Group: III 
GHS Classification
Signal: Danger
Flammable liquid and vapour
Harmful if inhaled vapour
Causes skin irritation
Causes eye irritation
Suspected of causing cancer
Causes damage to central nervous system and liver through prolonged or repeated exposure
Toxic to aquatic life 
flam;flameexcl mark;warncancer;health haz

Transport Emergency Card: TEC (R)-30S2055 or 30GF1-III-9.
NFPA Code: H2; F3; R2. 
Fireproof. Separated from incompatible materials. See Chemical Dangers. Cool. Keep in the dark. Store only if stabilized. Store in an area without drain or sewer access. 

Physical State; Appearance

Physical dangers

Chemical dangers
The substance can form explosive peroxides. The substance may polymerize due to warming, under the influence of light, oxidants, oxygen and peroxides. This generates fire and explosion hazard. Reacts violently with strong acids and strong oxidants. This generates fire and explosion hazard. Attacks rubber, copper and copper alloys. 

Occupational exposure limits
TLV: 20 ppm as TWA; 40 ppm as STEL; A4 (not classifiable as a human carcinogen); BEI issued; (ACGIH 2005).
MAK: 20 ppm, 86 mg/m³; Carcinogen category: 5; Peak limitation category: II(2); Pregnancy risk group: C; BAT issued; (DFG 2006). 

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

Inhalation risk
A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C. 

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. If this liquid is swallowed, aspiration into the lungs may result in chemical pneumonitis. The substance may cause effects on the central nervous system. Exposure at high levels could cause unconsciousness. 

Effects of long-term or repeated exposure
The liquid defats the skin. The substance may have effects on the central nervous system. Exposure to the substance may increase noise-induced hearing loss. This substance is possibly carcinogenic to humans. See Notes. 

Boiling point: 145°C
Melting point: -30.6°C
Relative density (water = 1): 0.91
Solubility in water, g/100ml at 20°C: 0.03
Vapour pressure, kPa at 20°C: 0.67
Relative vapour density (air = 1): 3.6
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.02
Flash point: 31°C c.c.
Auto-ignition temperature: 490°C
Explosive limits, vol% in air: 0.9-6.8
Octanol/water partition coefficient as log Pow: 3.0  
The substance is toxic to aquatic organisms. It is strongly advised not to let the chemical enter into the environment. 

Depending on the degree of exposure, periodic medical examination is indicated.
Check for peroxides prior to distillation; eliminate if found.
Styrene monomer vapours are uninhibited and may form polymers in vents or flame arresters of storage tanks, resulting in blockage of vents.
Do NOT take working clothes home.
Card has been partially updated in 2007: see Occupational Exposure Limits, Fire fighting. 


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
       Styrene (EHC 26, 1983)
       Styrene (WHO Food Additives Series 19)
       STYRENE (JECFA Evaluation)
       Styrene (PIM 509)
       Styrene (IARC Summary & Evaluation, Volume 60, 1994)
       Styrene (IARC Summary & Evaluation, Volume 82, 2002)