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Annex II Entry 1549 CMR30/07/2020

4-tert-Butylbenzoic acid

4-tert-Butylbenzoic acid is listed in Annex II as a prohibited substance for cosmetic products placed on the EU market.

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Prohibited substance— Annex II, EU Regulation 1223/2009
Entry: 1549
CMR

Chemical identity and properties

PubChem 2D chemical structure for CAS 98-73-7
CAS 98-73-7PubChem CID 7403

4-tert-Butylbenzoic acid

4-t-Butylbenzoic acid is an alkylbenzene. — ChEBI

IUPAC name
4-tert-butylbenzoic acid
Molecular formula
C11H14O2
Molecular weight
178.23 g/mol
Exact mass
178.099379685 Da
XLogP3
3.9
Topological polar surface area
37.3 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
2
Covalent units
1
Defined stereocentres
0

Also known as

P-TERT-BUTYLBENZOIC ACIDTBBABenzoic acid, 4-(1,1-dimethylethyl)-4-t-butylbenzoic acidBenzoic acid, p-tert-butyl-Benzoic acid, 4-tert-butyl-43Z7T3VN0RNSC-4802
16 more reported names
RefChem:100513202-696-34-(tert-butyl)benzoic acid4-tert-Butyl-benzoic acidp-t-Butylbenzoic acidNSC 48024-(1,1-dimethylethyl)benzoic acidKyselina p-terc.butylbenzoova4-~{tert}-butylbenzoic acid4-?tert-?Butylbenzoic AcidHSDB 5321EINECS 202-696-34-(tert-Butyl)benzoicacidKyselina p-terc.butylbenzoova [Czech]BRN 0607545UNII-43Z7T3VN0R
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Chemical name

4-tert-Butylbenzoic acid

Chemical / IUPAC name

4-tert-Butylbenzoic acid

Regulatory information

Regulation

(EU) 2019/831

See every entry this act set

Identified ingredients

CMR

CategoryCarcinogenicMutagenicReprotoxic
Cat. 1B——✓

Key data

CAS
98-73-7
EC
202-696-3
Annex
II
Entry number
1549

Inventory links for 4-tert-Butylbenzoic acid

Direct matches are limited for this record, so nearby entries from Annex II are shown as well.

Annex II 1547
Nearby record in the same annex

Tetrahydrofuran

CAS: 109-99-9
EC: 203-726-8
Annex II 1544
Nearby record in the same annex

Indium phosphide

CAS: 22398-80-7
EC: 244-959-5

What Annex II means for 4-tert-Butylbenzoic acid

4-tert-Butylbenzoic acid is listed as a prohibited substance under Annex II of EU Cosmetics Regulation 1223/2009 and must not be intentionally added. Article 17 separately addresses unintended small quantities that are technically unavoidable under good manufacturing practice and compatible with the Article 3 safety requirement.

Formulators must screen their ingredients and raw materials to ensure none contain this substance. Suppliers should provide documentation confirming absence when requested.

This record is linked to 1 CosIng inventory ingredient for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Verify this substance is absent from all raw materials and finished formulations.
  • Request absence confirmation or CoA from raw material suppliers.
  • Document the screening result in the Product Information File (PIF).
  • This substance has CMR classification. Review the CMR table above and verify current Annex II/III status before use.

Frequently asked questions

Yes. 4-tert-Butylbenzoic acid is listed in Annex II of EU Cosmetics Regulation 1223/2009 and is prohibited as an intentionally added cosmetic ingredient. Article 17 provides a narrow exception for unintended small quantities that are technically unavoidable under good manufacturing practice, provided the product remains safe under Article 3.

CAS 98-73-7 is the unique numerical identifier assigned to 4-tert-Butylbenzoic acid by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

4-tert-Butylbenzoic acid has a CMR (carcinogenic, mutagenic or reprotoxic) classification under EU CLP Regulation. Under Article 15 of EU Cosmetics Regulation 1223/2009, CMR substances of category 1A or 1B are prohibited in cosmetics unless specifically permitted. Category 2 CMR substances may be used only if assessed safe by the SCCS. Always verify current annex status and any applicable derogations before use.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
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Source note for Annex II record 4-tert-Butylbenzoic acid

This page summarizes one Annex II record for 4-tert-Butylbenzoic acid from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex II conditions for 4-tert-Butylbenzoic acid, but confirm any final regulatory decision against the current official annex wording and source files.

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