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Alpha-Methylstyrene is a clear, colorless liquid used primarily as a monomer in polymerization processes. It is especially valued as a comonomer to raise the glass transition temperature of copolymers such as ABS resins.
Polymerization monomerComonomer to raise glass transition temperature in acrylonitrile-butadiene-styrene resinsReactive diluent in unsaturated polyester 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.
Safety Reference
Flammable
Corrosive
Harmful
Health Hazard
Environmental Hazard
Warning
Customs Tariff Classification
The international HS code for Alpha-Methylstyrene (CAS 98-83-9) is 2902.90.
HS code (international, 6-digit)
2902.90
EU CN code (8-digit)
2902 90 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
prop-1-en-2-ylbenzene
InChIKey
XYLMUPLGERFSHI-UHFFFAOYSA-N
SMILES
CC(=C)C1=CC=CC=C1
Synonyms (50)
(1-Methylethenyl)benzene
(Prop-1-en-2-yl)benzene
.ALPHA.-METHYLVINYLBENZENE
1-METHYLVINYL BENZENE
1-Methyl-1-phenylethene
1-Methyl-1-phenylethylene
1-MethylethenylBenzine
1-Methylethylenebenzene
1-Phenyl-1-methylethylene
1-Propene, 2-phenyl-
2-Phenyl-1-propene
2-Phenyl-2-propene
2-Phenylpropene
2-Phenylpropylene
2-phenyl-1-propylene
2-phenylprop-1-ene
?-Methylstyrene
Benzene, (1-methylethenyl)-
Benzene, isopropenyl-
Isopropenil-benzolo
Isopropenil-benzolo [Italian]
Isopropenyl-benzeen
Isopropenyl-benzeen [Dutch]
Isopropenyl-benzol
Isopropenyl-benzol [German]
Isopropenylbenzene
Ortho brush killer a
POLY(I<<-METHYLSTYRENE)
Styrene, .alpha.-methyl-
a-Methylstyrene
alpha -Methylstyrene monomer
alpha-Menthylstyrene
alpha-Methyl-styrol [German]
alpha-Methylstyreen
alpha-Methylstyreen [Dutch]
alpha-Methylstyrene
alpha-Methylstyrol
alpha-Metil-stirolo
alpha-Metil-stirolo [Italian]
as-Methylphenylethylene
beta-Phenylpropene
beta-Phenylpropylene
H226
Flammable liquid and vapour
H319Causes serious eye irritation
H335May cause respiratory irritation
H411Toxic to aquatic life with long lasting effects
H304May be fatal if swallowed and enters airways
H315Causes skin irritation
H318Causes serious eye damage
H320Causes eye irritation
H336May cause drowsiness or dizziness
H351Suspected of causing cancer
H372Causes damage to organs through prolonged or repeated exposure
H373May cause damage to organs through prolonged or repeated exposure
H401Toxic to aquatic life
H371May cause damage to organs
H303May be harmful if swallowed
H341Suspected of causing genetic defects
H361Suspected of damaging fertility or the unborn child
