C8H8
104.15 g/mol
Industrial ChemicalDanger
STYRENE
CAS100-42-5EC202-851-5
Category
Industrial Chemical
Compound Class
Aromatic
Primary Use
Production of polystyrene plastics and resins
Styrene is an organic compound consisting of a vinyl group attached to a benzene ring. It is a colorless, oily liquid that may appear yellowish with age and is primarily used in the production of polystyrene plastics and resins.
Production of polystyrene plasticsProduction of resins
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 100-42-5
Related Compounds
ReferenceSame Category
4-vinylpyridine
CAS100-43-6
monomer for polymer synthesis
ReferenceSame Category
Cyclohexanemethanol
CAS100-49-2
organic synthesis intermediate
ReferenceSame Category
4-formylcyclohexene
CAS100-50-5
Chemical intermediate for epoxides and resins
ReferenceSame Category
Methylaniline
CAS100-61-8
solvent and organic synthesis
Referencestereoisomer of
(2H8)Styrene
CAS19361-62-7
pharmaceutical intermediate
Referencestereoisomer of
(²H₃)Ethenylbenzene
CAS3814-93-5
pharmaceutical intermediate
Safety Reference
Danger
H226Flammable liquid and vapour
H315Causes skin irritation
H319Causes serious eye irritation
H332Harmful if inhaled
H372Causes damage to organs through prolonged or repeated exposure
H304May be fatal if swallowed and enters airways
H335May cause respiratory irritation
H361Suspected of damaging fertility or the unborn child
H412Harmful to aquatic life with long lasting effects
H413May cause long lasting harmful effects to aquatic life
H401Toxic to aquatic life
H336May cause drowsiness or dizziness
H341Suspected of causing genetic defects
H350May cause cancer
H360May damage fertility or the unborn child
H370Causes damage to organs
H351Suspected of causing cancer
H400Very toxic to aquatic life
H411Toxic to aquatic life with long lasting effects
H303May be harmful if swallowed
Customs Tariff Classification
The international HS code for STYRENE (CAS 100-42-5) is 2902.50.
HS code (international, 6-digit)
2902.50
EU CN code (8-digit)
2902 50 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
styrene
InChIKey
PPBRXRYQALVLMV-UHFFFAOYSA-N
SMILES
C=CC1=CC=CC=C1
Synonyms (96)
- STYRENE
- SYN
- Annamene
- Benzene, (1Z)-ethenyl-2-d-
- Benzene, ethenyl-
- Benzene, vinyl-
- Bulstren K-525-19
- COLESTYRAMINE IMPURITY A
- Cinnamene
- Cinnamenol
- Cinnaminol
- Cinnamol
- Diarex hf 77 (Salt/Mix)
- Ethenylbenzene
- Ethenylbenzene, 9CI
- Ethylene, phenyl-
- FEMA No. 3233
- FEMA Number 3234
- Isotactic polystyrene
- MAOMIN SM
- Monomer, Styrene
- PhCH=CH2
- Phenethylene
- Phenylethene
- Phenylethylene
- Phenylethylene, inhibited
- Phenylethylene; Vinylbenzene
- Poly(Styrene-d8)
- Polystyrene
- Polystyrene (FG)
- Polystyrene, 1000
- Polystyrene, M.W. 50,000
- Polystyrene, for extrusion
- Polystyrene, impact resistive
- Polythrene(melt flow rate)
- STYRENE-ALPHA,2,3,4,5,6-D6
- STYRENE-ALPHA-13C
- Stirolo
- Stirolo [Italian]
- Styreen
- Styreen [Dutch]
- Styren
- Styren [Czech]
- Styrene - stabilised with TBC
- Styrene monomer
- Styrene monomer, inhibited
- Styrene, SAJ first grade
- Styrol
- Styrol [German]
- Styrole
- Styrolene
- Styron
- Styron (Salt/Mix)
- Styropol (Salt/Mix)
- Styropol SO
- Styropor
- Styropor (Salt/Mix)
- TTB 7302
- Vinylbenzen
- Vinylbenzen [Czech]
- Vinylbenzen [Dutch]
- Vinylbenzene
- Vinylbenzene, inhibited
- Vinylbenzol
- p-vinyl benzene
- trans-Styrene-(beta)-d