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Synthetic aroma chemicals

Styrene oxide

Also known as 2-Phenyloxirane, Phenyloxirane, Epoxystyrene

CAS 96-09-3Formula C8H8OMolar mass 120.15 g/molEC 202-476-7
GHS signal word: Danger. Pictograms: Harmful or irritant, Serious health hazard 41 suppliers listed
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Styrene oxide chemical structure, C8H8O, CAS 96-09-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless to pale straw-colored liquid
Melting point
-35.6 °C
Boiling point
194.1 °C
Density
Relative density (water = 1): 1.05
Flash point
74 °C
HS code
291090
Category
Synthetic aroma chemicals
UN number
UN 2810
Illustrative photo, clear liquid in a volumetric flask on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Styrene oxide?

Plain description, key identifiers and synonyms

Styrene oxide is an epoxide that is oxirane in which one of the hydrogens has been replaced by a phenyl group. It has a role as a human xenobiotic metabolite. It derives from a hydride of a styrene.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-phenyloxirane
CAS number
96-09-3 CAS number cross-checkedOther or deprecated CAS: 1189532-69-1, 192506-02-8
EC number
202-476-7
Molecular formula
C8H8O
UNII
9QH06NGT6O
MDL number
MFCD00005121
InChIKey
AWMVMTVKBNGEAK-UHFFFAOYSA-N
InChI
InChI=1S/C8H8O/c1-2-4-7(5-3-1)8-6-9-8/h1-5,8H,6H2
SMILES (canonical and isomeric)
C1C(O1)C2=CC=CC=C2

Synonyms

  • 2-Phenyloxirane
  • Phenyloxirane
  • Epoxystyrene
  • Phenylethylene oxide
  • 1,2-Epoxyethylbenzene
  • Styrene epoxide
  • Styryl oxide
  • Phenethylene oxide
  • 1-Phenyloxirane
  • Styrene 7,8-oxide
  • (Epoxyethyl)benzene
  • Phenyl oxirane
  • Epoxyethylbenzene
  • 1-Phenyl-1,2-epoxyethane
  • Benzene, (epoxyethyl)-
  • Styrene-7,8-oxide
  • 1,2-Epoxy-1-phenylethane
  • oxirane, 2-phenyl-
  • Fenyloxiran
  • Epoxyethyl benzene
  • alpha,beta-Epoxystyrene
  • Ethane, 1,2-epoxy-1-phenyl-
  • Oxirane, phenyl-
  • Styreneoxide
  • 2-phenyl-oxirane
Show all 36 synonyms
  • rac Styrene Oxide
  • (+/-)-styrene oxide
  • rac Styrene-d5 Oxide
  • (1,2-Epoxyethyl)benzene
  • (R)-(+)-Styrene-d5 Oxide
  • Benzene, (1,2-epoxyethyl)-
  • styrene oxide, (R)-isomer
  • styrene oxide, (S)-isomer
  • styrene oxide, (+-)-isomer
  • a,b-Epoxystyrene
  • 2-(phenyl)oxirane

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 pale straw-colored liquidexp.
Odour
Sweet, pleasantexp.
Melting point
-35.6 °Cexp.
Boiling point
194.1 °Cexp.
Density
Relative density (water = 1): 1.05exp.
Flash point
74 °Cexp.
Autoignition temperature
498 °Cexp.
Solubility
0.3% wt in waterexp.
Vapour pressure
0.3 mm Hg at 20 °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
120.15 g/molcalc.
Exact mass
120.0575 Dacalc.
LogP (octanol/water)
1.76calc.
Topological polar surface area
12.53 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
1calc.
Heavy atoms
9calc.
Rings
2calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.25calc.
Formal charge
0calc.
Stereocentres
1calc.
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, c1ccc(C2CO2)cc1

c1ccc(C2CO2)cc1

2 rings, 9 atoms. This chemical is the scaffold itself.

2,056 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
210NFPA 704 rating

Hazard statements

  • H312Harmful in contact with skin.
  • H319Causes serious eye irritation.
  • H350May cause cancer.
Precautionary statements (12)
  • P203Obtain, read and follow all safety instructions before use.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • 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.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2810

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 oxide suppliers

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

All 41 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

41 suppliers in 10 countries

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Styrene oxide 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

Highly reactive organic intermediate.

Used largely as intermediate in production of styrene glycol and its derivatives.

Reactive diluent for epoxy resins, chem intermed for cosmetics, surface coatings, treatment of fibers & textiles, agricultural & biological chemicals.

In japan, as raw material for production of phenylstearyl alcohol used in perfume.

Styrene oxide is used as a reactive plasticizer or diluent for epoxy resins, in the production of styrene glycol and its derivatives, as a raw material for the production of phenethyl alcohol used in perfumes, as a chemical intermediate for cosmetics, surface coatings, and agricultural and biological chemicals, and in the treatment of fibers and textiles.

Pharmacological actions

  • Carcinogens
  • Mutagens

Roles

  • animal metabolite
  • eukaryotic metabolite
  • human metabolite
  • human xenobiotic metabolite
  • mammalian metabolite
  • metabolite
  • xenobiotic metabolite

Functional uses

  • Fragrance

Pharmacology

Styrene Oxide is a synthetic, colorless liquid that is very soluble in water. Styrene oxide is used as a chemical intermediate in the production of styrene glycol and its derivatives, cosmetics, surface coatings and other chemicals (agricultural and biological). It is also used as a reactive diluent for epoxy resins and in cross-linked polyesters and polyurethanes. Humans in the general population may be exposed to styrene oxide by contact with contaminated air or water. It is reasonably anticipated to be a human carcinogen. (NCI05)

How it is made

(Styrene oxide) is produced commercially either by the chlorhydrin route or by epoxidation of styrene with peroxyacetic acid.

It is prepared either via the chlorohydrin route or catalytically with hydrogen peroxide.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 603-084-00-2

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: (Epoxyethyl)benzene (Styrene oxide), Ref no: 656, Annex ref: II/656

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 oxide is traded under.

HS 2910.90Indicative HS code

Epoxides with a three-membered ring and their halogenated, sulphonated, nitrated or nitrosated derivatives…

World exports in 2024
$467M
−2.9% vs 2023, imports $501M
2019 to 2024
Top exporters
  1. Netherlands24.5%
  2. China19.7%
  3. Japan18.8%
Top importers
  1. United States17.6%
  2. Germany16.3%
  3. China10.8%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Styrene oxide?

Styrene oxide is an epoxide that is oxirane in which one of the hydrogens has been replaced by a phenyl group. It has a role as a human xenobiotic metabolite. It derives from a hydride of a styrene.

What is the CAS number of Styrene oxide?

The CAS registry number of Styrene oxide is 96-09-3. Other or deprecated CAS numbers: 1189532-69-1, 192506-02-8.

What is the molecular formula and weight of Styrene oxide?

The molecular formula of Styrene oxide is C8H8O and its molar mass is 120.15 g/mol.

What is Styrene oxide used for?

Highly reactive organic intermediate. Used largely as intermediate in production of styrene glycol and its derivatives. Reactive diluent for epoxy resins, chem intermed for cosmetics, surface coatings, treatment of fibers & textiles, agricultural & biological chemicals.

Is Styrene oxide hazardous?

Styrene oxide carries the GHS signal word "Danger". Main hazards: harmful in contact with skin, causes serious eye irritation, may cause cancer. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Styrene oxide?

Styrene oxide is usually classified under HS code 291090 (Epoxides, epoxyalcohols, epoxyphenols and epoxyethers, with a three-membered ring, and…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Styrene oxide?

CompoundList lists 41 suppliers of Styrene oxide in China, United States, India, Canada and 6 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 oxide in India?

3 suppliers in India list Styrene oxide 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 oxide?

Suppliers quote Styrene oxide 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 oxide

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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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