C9H10
118.18 g/mol
Industrial ChemicalWarning
Alpha-Methylstyrene
CAS98-83-9EC202-705-0
Category
Industrial Chemical
Compound Class
Aromatic
Primary Use
Polymerization monomer comonomer
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.
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 98-83-9
Related Compounds
ReferenceSame Category
Benzoyl chloride
CAS98-88-4
Production of benzoyl peroxide and dye intermediates
ReferenceSame Category
3,5-Diiodopyridin-4-amine
CAS98136-86-8
industrial chemical intermediate
ReferenceSame Category
2,4,5-Trifluorobenzonitrile
CAS98349-22-5
intermediate for pharmaceuticals and agrochemicals
ReferenceSame Category
1,1-Dibromo-2,2-bis(chloromethyl)cyclopropane
CAS98577-44-7
synthetic intermediate for organic chemistry
Safety Reference
Warning
H226Flammable 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
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