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Aromatics

alpha-Methylstyrene

Also known as 2-Phenylpropene, 2-Phenyl-1-propene, 2-Phenylpropylene

CAS 98-83-9Formula C9H10Molar mass 118.18 g/molEC 202-705-0
GHS signal word: Warning. Pictograms: Flammable, Harmful or irritant, Hazardous to the environment 63 suppliers listed
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alpha-Methylstyrene chemical structure, C9H10, CAS 98-83-9
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless liquid
Melting point
-23.2 °C
Boiling point
165.4 °C
Density
Critical volume, 3.26 ml/g, critical density, 0.29 g/ml, specific heat of liquid, 2.0460…
Flash point
83.9 °C
HS code
290290
Category
Aromatics
UN number
UN 2303
Illustrative photo, clear liquid in sealed glass ampoules on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is alpha-Methylstyrene?

Plain description, key identifiers and synonyms

Alpha-Methylstyrene is an olefinic compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
prop-1-en-2-ylbenzene
CAS number
98-83-9 CAS number cross-checkedOther or deprecated CAS: 25086-17-3
EC number
202-705-0
Molecular formula
C9H10
UNII
D46R9753IK
MDL number
MFCD00008859
InChIKey
XYLMUPLGERFSHI-UHFFFAOYSA-N
InChI
InChI=1S/C9H10/c1-8(2)9-6-4-3-5-7-9/h3-7H,1H2,2H3
SMILES (canonical and isomeric)
CC(=C)C1=CC=CC=C1

Synonyms

  • 2-Phenylpropene
  • 2-Phenyl-1-propene
  • 2-Phenylpropylene
  • Benzene, (1-methylethenyl)-
  • 1-Methyl-1-phenylethylene
  • alpha-Methylstyrol
  • 1-Phenyl-1-methylethylene
  • beta-Phenylpropylene
  • 1-Methyl-1-phenylethene
  • beta-Phenylpropene
  • as-Methylphenylethylene
  • alpha-Methyl styrene
  • 1-Propene, 2-phenyl-
  • 2-Phenyl-2-propene
  • Isopropenyl-benzol
  • Isopropenil-benzolo
  • Isopropenyl-benzeen
  • alpha-methyl-styrene
  • 1-Methylethylenebenzene
  • alpha-Methylstyreen
  • alpha-Methyl-styrol
  • alpha-Metil-stirolo
  • Benzene, isopropenyl-
  • 1-Methylvinyl benzene
  • 2-phenyl propylene
Show all 32 synonyms
  • Isopropenylbenzene
  • prop-1-en-2-ylbenzene
  • (1-Methylethenyl)benzene
  • a-Methylstyrene
  • (Prop-1-en-2-yl)benzene
  • Styrene, alpha-methyl-
  • isopropenyl-benzene

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Colorless liquidexp.
Odour
Characteristic odor.exp.
Melting point
-23.2 °Cexp.
Boiling point
165.4 °Cexp.
Density
Critical volume, 3.26 ml/g, critical density, 0.29 g/ml, specific heat of liquid, 2.0460 J/g deg K at 40 °C, & 2.1757 J/g deg K at 100 °C, specific heat of vapor, 1.2357 J/g deg K at 25 °C, heat of formation of liquid, 112.97 kJ/mol at 25…exp.
Flash point
83.9 °Cexp.
Autoignition temperature
574 °Cexp.
Solubility
In water, 116 mg/l @ 25 °Cexp.
Vapour pressure
1.9 mm Hg @ 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
118.18 g/molcalc.
Exact mass
118.0783 Dacalc.
LogP (octanol/water)
2.72calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
9calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.11calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment
211NFPA 704 rating

Hazard statements

  • H226Flammable liquid and vapour.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (22)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P337 + P317If eye irritation persists: Get medical help.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2303
Transport hazard class
3
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

alpha-Methylstyrene suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 63 suppliers
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Where suppliers are based

63 suppliers in 21 countries

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alpha-Methylstyrene price

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Uses and applications

What the substance is used for, by industry and function

Polymerization monomer, especially for polyesters.

Used as a third monomer to raise the glass transition temperature in acrylonitrile-butadiene-styrene rubber-thermoplastic resin.

Polyvinyl chloride/high temperature ABS comonomer, reactive diluent (unsaturated polyester resins).

Used as a UV degradation inhibitor in acrylonitrile-butadiene-styrene resins.

The dominant merchant market application is as a comonomer in acrylonitrile-butadiene-styrene resins.

Industrial uses: Intermediate, Heat stabilizer, Hardener, Adhesion/cohesion promoter, Filler, Monomers, Chain transfer agent.

Consumer uses: Sizing agent, Chain transfer agent, Monomers, Filler, Adhesion/cohesion promoter, Hardener, Heat stabilizer.

Functional uses

  • Flavouring and nutrient

How it is made

Primarily produced as a by-product of cumene-phenol operations... Alkylation of benzene with propylene followed by dehydrogenation of isopropylbenzene to alpha-methylstyrene was practiced commercially by Dow until 1977.

Cumene hydroperoxide (acid-catalyzed hydrolysis, by product of phenol acetone production), cumene (dehydrogenation)

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 601-027-00-6

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code alpha-Methylstyrene is traded under.

HS 2902.90Indicative HS code

Cyclic hydrocarbons, other

World exports in 2024
$612M
−6.1% vs 2023, imports $670M
2019 to 2024
Top exporters
  1. China28.0%
  2. Germany13.9%
  3. India * partner reported12.6%
Top importers
  1. Germany11.1%
  2. United States10.6%
  3. South Korea8.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for alpha-Methylstyrene is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about alpha-Methylstyrene, based on the data on this page

What is alpha-Methylstyrene?

Alpha-Methylstyrene is an olefinic compound.

What is the CAS number of alpha-Methylstyrene?

The CAS registry number of alpha-Methylstyrene is 98-83-9. Other or deprecated CAS numbers: 25086-17-3.

What is the molecular formula and weight of alpha-Methylstyrene?

The molecular formula of alpha-Methylstyrene is C9H10 and its molar mass is 118.18 g/mol.

What is alpha-Methylstyrene used for?

Polymerization monomer, especially for polyesters. Used as a third monomer to raise the glass transition temperature in acrylonitrile-butadiene-styrene rubber-thermoplastic resin. Polyvinyl chloride/high temperature ABS comonomer, reactive diluent (unsaturated polyester resins).

Is alpha-Methylstyrene hazardous?

alpha-Methylstyrene carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of alpha-Methylstyrene?

alpha-Methylstyrene is usually classified under HS code 290290 (Cyclic hydrocarbons, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy alpha-Methylstyrene?

CompoundList lists 63 suppliers of alpha-Methylstyrene in United States, China, India, Netherlands and 17 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy alpha-Methylstyrene in India?

5 suppliers in India list alpha-Methylstyrene on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of alpha-Methylstyrene?

Suppliers quote alpha-Methylstyrene on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle alpha-Methylstyrene

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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