Why does CAS 64-67-5 appear in more than one EU cosmetic annex?

A substance identified by CAS 64-67-5 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 64-67-5?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 64-67-5 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 64-67-5

Q: How do I use CAS 64-67-5 for compliance screening?

Cross-reference CAS 64-67-5 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 64-67-5 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 64-67-5

CAS 64-67-5PubChem CID 6163

Diethyl Sulfate

Diethyl sulfate is the diethyl ester of sulfuric acid. It has a role as an alkylating agent, a mutagen, a carcinogenic agent and an apoptosis inducer. — ChEBI

IUPAC name: diethyl sulfate

Molecular formula: C4H10O4S
Molecular weight: 154.19 g/mol
Exact mass: 154.02997997 Da
XLogP3: 1.1
Topological polar surface area: 61.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

Diethyl sulphateSulfuric acid, diethyl esterDIETHYLSULFATEDiaethylsulfatSulfuric acid diethyl esterDiethyl tetraoxosulfateDiethylester kyseliny siroveK0FO4VFA7I

16 more reported names

NSC-56380CHEBI:34699RefChem:133445Sufuric Acid Diethyl Ester200-589-6Montelukast Impurity 15NSC 56380Ethyl sulfate (Et2SO4)ethyl ethoxysulfonateDiaethylsulfat [German]DES (VAN)CAS-64-67-5Diethyl MonosulfateCCRIS 242HSDB 1636Diethylester kyseliny sirove [Czech]

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:34699
ChEMBL:CHEMBL163100
EPA DTXSID:DTXSID1024045
PubMed:23091351
PubMed:22822371
PubMed:22805825
PubMed:22526790
PubMed:22291056
PubMed:22272102
PubMed:22265837
PubMed:22242244
PubMed:22215644
PubMed:22213685
PubMed:22043793
PubMed:21984165

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 64-67-5

1 total

Annex

Entry

749

Diethyl sulphate

200-589-6

CMR

How CAS 64-67-5 is used on this site

CAS 64-67-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares 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 64-67-5 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 64-67-5 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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