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Monomers

Styrene

Also known as Ethenylbenzene, Phenylethylene, Vinylbenzene

CAS 100-42-5Formula C8H8Molar mass 104.15 g/molEC 202-851-5
GHS signal word: Danger. Pictograms: Flammable, Harmful or irritant, Serious health hazard 381 suppliers listed
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Styrene chemical structure, C8H8, CAS 100-42-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless to yellowish, oily liquid
Melting point
-30.6 °C
Boiling point
145.3 °C
Density
0.9016 g/cm³ at 25 °C
Flash point
32 °C
HS code
290250
Category
Monomers
UN number
UN 2055
Illustrative photo, clear liquid in sealed glass ampoules on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Styrene?

Plain description, key identifiers and synonyms

Styrene is a vinylarene that is benzene carrying a vinyl group. It has been isolated from the benzoin resin produced by Styrax species. It has a role as a mutagen, a mouse metabolite and a plant metabolite. It is a volatile organic compound, a member of styrenes and a vinylarene.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
styrene
CAS number
100-42-5 CAS number cross-checkedOther or deprecated CAS: 12770-88-6, 217501-55-8, 25086-18-4, 29967-69-9, 6911-81-5, 98444-30-5
EC numbers
202-851-5, 616-714-6, 619-344-3, 633-281-9
Molecular formula
C8H8
UNII
44LJ2U959V
MDL number
MFCD00008612, MFCD00084450
INCI name
STYRENE
InChIKey
PPBRXRYQALVLMV-UHFFFAOYSA-N
InChI
InChI=1S/C8H8/c1-2-8-6-4-3-5-7-8/h2-7H,1H2
SMILES (canonical and isomeric)
C=CC1=CC=CC=C1

Synonyms

  • Ethenylbenzene
  • Phenylethylene
  • Vinylbenzene
  • Styrol
  • Cinnamene
  • Styrene monomer
  • Benzene, ethenyl-
  • Phenylethene
  • Styrolene
  • Phenethylene
  • Vinylbenzol
  • Styrole
  • Vinyl benzene
  • Styropol SO
  • Cinnamol
  • Styren
  • Benzene, vinyl-
  • Cinnamenol
  • Ethylene, phenyl-
  • Vinylbenzen
  • Stirolo
  • Styreen
  • Vinyl-benzene
  • TTB 7302
  • Styropor
Show all 36 synonyms
  • Monomer, Styrene
  • Bulstren K-525-19
  • Annamene
  • Cinnaminol
  • Isotactic polystyrene
  • trans-Styrene-(beta)-d
  • Polythrene(melt flow rate)
  • Styrene-alpha-13c
  • Phenylethylene, Vinylbenzene
  • Styrol (German)
  • Styrene-alpha,2,3,4,5,6-d6

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 to yellowish, oily liquidexp.
Odour
Characteristic, sweet, balsamic, almost floral odor that is extremely penetratingexp.
Melting point
-30.6 °Cexp.
Boiling point
145.3 °Cexp.
Density
0.9016 g/cm³ at 25 °Cexp.
Flash point
32 °Cexp.
Autoignition temperature
490 °Cexp.
Solubility
In water, 300 mg/L at 25 °Cexp.
Vapour pressure
6.40 mm Hg at 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
104.15 g/molcalc.
Exact mass
104.0626 Dacalc.
LogP (octanol/water)
2.33calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
1calc.
Heavy atoms
8calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
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
Danger
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
322WNFPA 704 rating

Hazard statements

  • H226Flammable liquid and vapour.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H332Harmful if inhaled.
  • H361dSuspected of damaging the unborn child.
  • H372Causes damage to organs through prolonged or repeated exposure.
Precautionary statements (29)
  • P203Obtain, read and follow all safety instructions before use.
  • 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.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • 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.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • 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 2055
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

Styrene suppliers

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

All 381 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

381 suppliers in 53 countries

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Styrene price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Manufacture of plastics, synthetic rubber, resins, insulator.

Polystyrene, SBR (styrene-butadiene-rubber), ABS (acrylonitrile-butadiene-styrene) and SAN (styrene-acrylonitrile) resins, protective coatings (styrene-butadiene latex, alkyds), styrenated polyesters, rubber-modified polystyrene, copolymer resins, intermediate.

Reported uses (ppm):

Table: Reported uses (ppm): (Flavor and Extract Manufacturers' Association) [Table#625].

The major uses for styrene are in plastics, latex paints and coatings, synthetic rubbers, polyesters and styrene-alkyd coatings. The broad spectrum of uses of these products includes construction, packaging, automotive and household goods. Packaging is the single largest application for styrenecontaining resins, particularly foams, used as fillers and cushioning.

Read more

Construction applications include pipes, fittings, tanks, lighting fixtures and corrosion-resistant products. Household goods include synthetic marble, flooring, disposable tableware and moulded furnishings. Transport applications range from tyres to reinforced plastics and automobile body putty.

Styrene is used predominately in the production of polystyrene plastics and resins. Styrene is also used as an intermediate in the synthesis of materials used for ion exchange resins and to produce copolymers.

Industrial uses: Plasticizer, Filler, Intermediate, Etching agent, Solvent, Other, Monomers.

Consumer uses: Antioxidant, Fuel agents, Monomers, Binder, Solvent, Adhesion/cohesion promoter, Intermediate, Filler.

Use classes: Volatile organic compounds.

Cosmetic ingredient, INCI name STYRENE(solvent)

Roles

  • aetiopathogenetic role
  • animal metabolite
  • eukaryotic metabolite
  • genotoxin
  • mammalian metabolite
  • metabolite
  • mouse metabolite
  • mutagen
  • plant metabolite

Functional uses

  • Binder
  • Flavouring and nutrient
  • Fragrance
  • Monomers
  • Viscosity modifier

Cosmetic functions

  • Solvent

How it is made

Direct dehydrogenation of ethylbenzene to styrene accounts for 85% of commercial production. The reaction is carried out in the vapor phase with steam over a catalyst consisting primarily of iron oxide. The reaction is endothermic, and can be accomplished either adiabatically or isothermally.

Styrene is produced mainly by catalytic dehydrogenation of high-purity ethylbenzene in the vapor phase. Typical catalysts are based on ferric oxide with the additives chromia (Cr2O3) (stabilizer) and potassium oxide (coke retardant).

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Fractionation of the product results in separation of high-purity styrene, unconverted ethylbenzene and minor reaction by-products such as toluene and benzene.

A smaller amount of styrene is produced as a co-product from a propylene oxide process. In this route, ethylbenzene is oxidized to its hydroperoxide and reacted with propylene to yield propylene oxide. The co-product methyl phenyl carbinol is then dehydrated to styrene.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 601-026-00-0

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Styrene, Ref no: 1575, Annex ref: II/1575

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 Styrene is traded under.

HS 2902.50Exact HS code

Cyclic hydrocarbons: styrene

World exports in 2024
$7.41B
−9.3% vs 2023, imports $7.64B
2019 to 2024
Top exporters
  1. United States23.0%
  2. Saudi Arabia19.4%
  3. Netherlands18.8%
Top importers
  1. Turkey10.9%
  2. India * partner reported10.5%
  3. South Korea8.9%

* Partner reported figures, a lower bound.

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

The HS code shown for Styrene is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Styrene, based on the data on this page

What is Styrene?

Styrene is a vinylarene that is benzene carrying a vinyl group. It has been isolated from the benzoin resin produced by Styrax species. It has a role as a mutagen, a mouse metabolite and a plant metabolite. It is a volatile organic compound, a member of styrenes and a vinylarene.

What is the CAS number of Styrene?

The CAS registry number of Styrene is 100-42-5. Other or deprecated CAS numbers: 12770-88-6, 217501-55-8, 25086-18-4.

What is the molecular formula and weight of Styrene?

The molecular formula of Styrene is C8H8 and its molar mass is 104.15 g/mol.

What is Styrene used for?

Manufacture of plastics, synthetic rubber, resins, insulator. Polystyrene, SBR (styrene-butadiene-rubber), ABS (acrylonitrile-butadiene-styrene) and SAN (styrene-acrylonitrile) resins, protective coatings (styrene-butadiene latex, alkyds), styrenated polyesters, rubber-modified polystyrene, copolymer resins, intermedi…

Is Styrene hazardous?

Styrene carries the GHS signal word "Danger". Main hazards: flammable liquid and vapour, causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Styrene?

Styrene is usually classified under HS code 290250 (Styrene). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Styrene?

CompoundList lists 381 suppliers of Styrene in United States, India, China, Germany and 49 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Styrene in India?

52 suppliers in India list Styrene on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Styrene?

Suppliers quote Styrene 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 Styrene

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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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