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STYRENE

Also known as Ethenyl-benzene; Vinylbenzene; Phenylethylene; Styrol; Styrolene; Cinnamene

CAS 100-42-5EC 202-851-5PubChem CID 7501

SOLVENTIrritancy 3/5 · Comedogenic –/5Prohibited / high-risk

What it is and how it is used

Styrene; restricted industrial solvent/monomer in cosmetics, present only as a trace impurity.

Status in national inventories

EU · CosIng41112功能 SOLVENT · 限制 II/1575
EU · CosIng97757附录 II · 限制 <empty>; as a constituent of other substances, or in mixtures, in concentrations equal to, or greater than 0.1% by weight; Shall not be placed on the market, or used, as substance or in mixtures in concentrations equal to ot grea
EU · Annexes to 1223/2009II/1575附录 II 禁用 · 序号 1575
ASEAN · Cosmetic DirectiveASEAN-II/1575附录 II 禁用 · Ref 1575

Matched on the exact INCI name; salts, esters and synonyms may be missed. The latest official text prevails.

Regulatory status by market Prohibited / restricted / permitted — listing is not approval

Asia-Pacific

MarketStatusConditions (as published)Source
ASEANASEAN Cosmetic Committee
Applies in 10 countries / territories

Singapore · Thailand · Malaysia · Indonesia · Philippines · Vietnam · Brunei · Cambodia · Laos · Myanmar

ProhibitedACD Annex II附录 II 禁用 · Ref 1575ASEAN Cosmetic Directive Annexes rel. 2026-06-10 (NPRA)C · Official source
KoreaMFDSProhibited화장품 사용제한 원료구분: 금지; 표준명: 스타이렌; CASNo: 100-42-5; 이명: Benzene, ethenyl-, Phenthylene; 영문명: Styrenekr-mfdsC · Official source

Americas

MarketStatusConditions (as published)Source
United States · CaliforniaCDPHListed onlyCSCP reportable ingredient
Reportable ingredient under the California Safe Cosmetics Act: reported to CDPH as known or suspected to cause cancer, birth defects, or other developmental or … Show full text

Reportable ingredient under the California Safe Cosmetics Act: reported to CDPH as known or suspected to cause cancer, birth defects, or other developmental or reproductive harm. Chemical name (as reported): Styrene; CAS 100-42-5; reported in 53 product records from 9 companies; top categories: Fragrances | Hair Care Products (non-coloring) | Skin Care Products; 13 records discontinued/reformulated; reports 2009-10-09..2020-03-20.

ca-cdphC · Official source

EMEA

MarketStatusConditions (as published)Source
Eurasian Economic UnionEurasian Economic Commission
Applies in 5 countries / territories

Russia · Belarus · Kazakhstan · Armenia · Kyrgyzstan

ProhibitedТР ТС 009/2011 Приложение 1 (Решение № 64, позиции 1384-1680)Решение № 64 · строка 591 · Стирол · CAS 100-42-5ТР ТС 009/2011 приложение 1, Решение Совета ЕЭК № 64 от 2022C · Official source
European UnionEuropean Commission
Applies in 30 countries / territories

Austria · Belgium · Bulgaria · Croatia · Cyprus · Czechia · Denmark · Estonia · Finland · France · Germany · Greece · Hungary · Ireland · Italy · Latvia · Lithuania · Luxembourg · Malta · Netherlands · Poland · Portugal · Romania · Slovakia · Slovenia · Spain · Sweden · Norway · Iceland · Liechtenstein

ProhibitedEU Annex II附录 II 禁用 · 序号 1575EU Regulation 1223/2009 consolidated 2026-05-01 (EUR-Lex)C · Official source
GCC Standardization OrganizationGSO
Applies in 6 countries / territories

Saudi Arabia · UAE · Oman · Qatar · Kuwait · Bahrain

ProhibitedGSO 1943:2021 Annex → EU Annex II附录 II 禁用 · 序号 1575GSO 1943:2021 Annex 2/3/4/5/6 → 动态引用 EU 1223/2009 附录(原文:listC · Official source
United KingdomOPSSProhibitedUK Annex IIStyrene · 100-42-5 · 202-851-5 · UK Annex II · No 1575UK Cosmetics Regulation (assimilated Regulation (EC) No 1223C · Official source

Public regulatory text on file for 7 jurisdiction(s), covering 58 countries / territories once regional blocs are expanded. Other markets have no public data here — absence is neither approval nor prohibition. Table updated 2026-09-22.

Compiled from publicly published regulatory texts; conditions are reproduced as published, neither rewritten nor translated. The latest official announcement of the target market prevails — this table is a compiled reference, not a compliance conclusion. Matched on the INCI name; salts, esters and synonyms may be missed. Usability and labelling are for the brand and its responsible person to verify against the full text.

Popular products with this ingredient 6 products

Functions from EU CosIng and the China inventory; irritancy, comedogenicity and rating are our internal reading, not a regulatory conclusion. Structure and molecular data from PubChem.

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