Why does CAS 51229-78-8 appear in more than one EU cosmetic annex?

A substance identified by CAS 51229-78-8 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts — for example, restricted under Annex III with specific conditions, while also appearing in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

How do I check if my formula contains a substance with CAS 51229-78-8?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 51229-78-8 to screen it directly, then review every linked annex record and supplier document.

CAS 2 records

CAS 51229-78-8

Q: How do I use CAS 51229-78-8 for compliance screening?

Cross-reference CAS 51229-78-8 against your raw material specification sheets and CoA documents. When it appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met. All annex entries sharing this CAS number are listed on this page.

CAS 51229-78-8 matches 2 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 51229-78-8

CAS 51229-78-8PubChem CID 6435993

cis-1-(3-Chloroallyl)-3,5,7-triaza-1-azoniaadamantane chloride

Quaternium-15 is a quaternary ammonium salt used as a preservative in many cosmetics and industrial substances. It acts as a formaldehyde releaser. It can cause contact dermatitis in sensitive individuals. It's toxicity is also due to it's ability to react and release formaldehyde and nitrosamines, both of which are believed to be carcinogenic. (L1890, L1897) — Toxin and Toxin Target Database (T3DB)

IUPAC name: 1-[(Z)-3-chloroprop-2-enyl]-3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane chloride

Molecular formula: C9H16Cl2N4
Molecular weight: 251.15 g/mol
Exact mass: 250.0752019 Da
Topological polar surface area: 9.7 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 2
Defined stereocentres: 0

Also known as

Chloroallyl methenamine chlorideQuaternium-15 cis-formUNII-LIT014L4RHLIT014L4RHCOSEPT 200EC 426-020-3QUATERNIUM-15 CIS-FORM [II]QUATERNIUM-15 CIS-FORM [MI]

16 more reported names

1-(3-CHLOROALLYL)-3,5,7-TRIAZA-1-AZONIAADAMANTANE CHLORIDE, CIS-QUATERNIUM-15 CIS-FORM (II)3,5,7-TRIAZA-1-AZONIATRICYCLO(3.3.1.13,7)DECANE, 1-((2Z)-3-CHLORO-2-PROPEN-1-YL)-, CHLORIDE (1:1)RefChem:126386426-020-3Dowicil 2001-((Z)-3-Chloroallyl)-1,3,5,7-tetraazaadamantan-1-ium chloridecis-N-(3-Chloroallyl) hexaminium chlorideHexamethylenetetramine cis-chloroallyl chlorideC9H16Cl2N41-(cis-3-Chloroallyl)-3,5,7-triaza-1-azoniaadamantane chloridecis-1-(3-Chloroallyl)-3,5,7-triaza-1-azoniaadamantantane Chloride1-(3-Chloroallyl)-3,5,7-triaza-1-azoniaadamantane chloride, cis form3,5,7-Triaza-1-azoniatricyclo(3.3.1.13,7)decane, 1-((2Z)-3-chloro-2-propenyl)-, chloride3,5,7-Triaza-1-azoniatricyclo(3.3.1.13,7)decane, 1-(3-chloro-2-propenyl)-, chloride, (Z)-1-[(2Z)-3-CHLOROPROP-2-EN-1-YL]-1,3,5,7-TETRAAZATRICYCLO[3.3.1.1(3),?]DECAN-1-IUM CHLORIDE

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEMBL:CHEMBL3181805
EPA DTXSID:DTXSID0035748

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

Records for CAS 51229-78-8

2 total

Annex

Entry

1385

Cis-1-(3-chloroallyl)-3,5,7- triaza-1-azoniaadamantane chloride (cis-CTAC)

426-020-3

Annex

Entry

1386

Cis-1-(3-chlorallyl)-3,5,7-triaza-1-azoniaadamantane chloride (cis-CTAC), quaternium-15

426-020-3

How CAS 51229-78-8 is used on this site

CAS 51229-78-8 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 2 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 51229-78-8 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.

Frequently asked questions

A substance identified by CAS 51229-78-8 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts. For example, a substance might be restricted under Annex III with specific conditions, and the same CAS might also appear in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

Cross-reference the CAS number against your raw material specification sheets and CoA documents. When a CAS appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met in your formulation. All annex entries sharing this CAS number are listed above.

A CAS number is assigned by the Chemical Abstracts Service (USA) and is globally recognised. An EC number is a European Commission identifier from inventories such as EINECS, ELINCS or the NLP list. Both identifiers may appear in EU cosmetic annex entries. Some substances have both, some have only one, and some older entries may have neither.

The INCI Checker accepts ingredient names, CAS numbers and EC numbers. Check this CAS number directly, then verify the result against supplier specification sheets and every linked annex condition.

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