Molecular Structure:

Molecular Formula: (C₈H₈)n
Molecular Weight: 360.8777
IUPAC Name: Styrene
Synonyms of Styrene polymer (CAS NO.9003-53-6): Benzene, ethenyl-, homopolymer ; Ethenylbenzene, homopolymer ; Polystyrene ; Polystyrene resin
CAS NO: 9003-53-6
Classification Code: Mutation data ; TSCA Flag XU [Exempt from reporting under the Inventory Update Rule] ; Tumor data
Melting point: 212 °C 
Index of Refraction: 1.557
Molar Refractivity: 37.17 cm³
Molar Volume: 115.3 cm³
Surface Tension: 30.9 dyne/cm
Density: 0.902 g/cm³
Flash Point: 31.1 °C
Enthalpy of Vaporization: 36.65 kJ/mol
Boiling Point: 145.2 °C at 760 mmHg
Vapour Pressure: 6.21 mmHg at 25°C

 Styrene polymer (CAS NO.9003-53-6) is a thermoplastic resin with good processing properties. It is used in many applications including electronic goods, food packaging, domestic appliances, toys, household goods and furniture.

IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 56.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 19 ,1979,p. 231.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . Reported in EPA TSCA Inventory.

Hazard Codes of Styrene polymer (CAS NO.9003-53-6): Xi
Risk Statements: 41 
R41:Risk of serious damage to the eyes.
Safety Statements: 26-36/37/39-24/25 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S24/25:Avoid contact with skin and eyes.
RIDADR: 2211
WGK Germany: 3
RTECS: WL6475000
HazardClass: 9
Questionable carcinogen with experimental tumorigenic data by implant. When heated to decomposition it emits acrid smoke and irritating fumes. See also POLYMERS, WATER-INSOLUBLE.