Ingredient Dictionary

STYRENE

Styrene can cause cancer according to The National Toxicology Program.

Definition

Styrene can cause cancer according to The National Toxicology Program.

Source: PubChem

US FDA substance register · UNII 44LJ2U959V · registered name Styrene · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Styrene is the organic compound that conforms to the formula:

Cosmetic roles

Base that dissolves other ingredientsSOLVENT

Safety & regulatory references

Banned: ASEAN · European Union · United Kingdom

Source: ASEAN Cosmetic Directive · EU Cosmetics Regulation · MFDS (Korea) cosmetic regulatory information · UK cosmetics regulations (OPSS)

Korea’s toxic-substance GHS classification: Danger · H304 (category 1) · H372 (category 1) · H335 (category 3) · +6 more

Source: Korea toxic substances GHS register (NIER)

EU Cosmetics Regulation, Annex II (prohibited substances), entry 1575

Source: EU prohibited substances (Annex II)

Restriction II/1575

Source: EU CosIng ingredient list

More data — names, identifiers, properties, test records, literature

Official labels & definitions

JCIA labelling name スチレン: 本品は、次の化学式で表される有機化合物である。

Source: JCIA labelling names (Japan)

Names & identifiers

STYRENEINCI스타이렌Korean label name (MFDS standard)Benzene, ethenyl-SynonymスチレンJapanese labelling name

CAS No.chemical registry number: 100-42-5
EC No.EU chemical inventory number: 202-851-5
DTXSIDUS EPA chemical ID: DTXSID2021284
DTXCIDUS EPA compound ID: DTXCID501284

IUPAC: Ethenylbenzene
Molecular formula: C8H8
Molecular weight: 104.152 g/mol

Measured properties

Melting/freezing point: -30.6 ℃
Initial boiling point and range: 145 ℃
Flash point: 31 ℃
Upper/lower flammability or explosive limits: 6.8 / 0.9 %
Vapour pressure: 0.67 ㎪(20℃)
Water solubility: 310 ㎎/ℓ(25℃)
Vapour density: 3.6
Relative density: 0.91
n-Octanol/water partition coefficient (Kow): 2.95
Auto-ignition temperature: 490 ℃
Decomposition temperature: -4395.63 K
Viscosity: 0.696 cP(25℃)
Molecular weight: 104.14

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: KOSHA safety data sheets (Korea)

What products actually use it for

What the 226 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

Monomers151
Binder39
Fragrance4
Intermediate4
Filler3
Processing aids not otherwise specified3
Antioxidant2
Viscosity modifier2

12 other uses

Plating agent2
Fuel2
Pigment2
Fuel agents2
Surfactant (surface active agent)2
Solvent2
Elasticizer1
Catalyst1
Cleaning agent1
Hardener1
Diluent1
Flavouring and nutrient1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

5 skin studies and 4 eye studies are on record.

Classed as moderate1

The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 9 studies

Category 2
Skin Irritation · Screening
Classification not possible
Skin Sensitization · Screening
Skin Irrit. 2
Skin Irritation · Screening
Skin Irrit. 2
Skin Irritation · Authoritative
Category 6.3A (Category 2)
Skin Irritation · Read Across
Eye Irrit. 2
Eye Irritation · Authoritative
Eye Irrit. 2
Eye Irritation · Screening
Category 6.4A (Category 2A)
Eye Irritation · Read Across
Category 2A
Eye Irritation · Screening