Why does CAS 556-52-5 appear in more than one EU cosmetic annex?

A substance identified by CAS 556-52-5 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 556-52-5?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 556-52-5 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 556-52-5

Q: How do I use CAS 556-52-5 for compliance screening?

Cross-reference CAS 556-52-5 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 556-52-5 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 556-52-5

CAS 556-52-5PubChem CID 11164

Glycidol

Glycidol is a primary alcohol and an epoxide. It is functionally related to a 1,2-epoxypropane. — ChEBI

IUPAC name: oxiran-2-ylmethanol

Molecular formula: C3H6O2
Molecular weight: 74.08 g/mol
Exact mass: 74.036779430 Da
XLogP3: -0.9
Topological polar surface area: 32.8 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

Oxiranemethanol2,3-Epoxy-1-propanolGlycide1-Propanol, 2,3-epoxy-Epihydrin alcoholOxiranylmethanol2-(Hydroxymethyl)oxiraneGlycidyl alcohol

16 more reported names

2,3-Epoxypropanol3-Hydroxypropylene oxide2-OxiranemethanolEpoxypropyl alcoholAllyl alcohol oxideMonoepoxide glycidolMethanol, oxiranyl-2,3-Epoxypropan-1-ol3-Hydroxy-1,2-epoxypropane1,2-Epoxy-3-hydroxypropane1-Hydroxy-2,3-epoxypropane(RS)-Glycidol2-HydroxymethyloxiranHydroxymethyl ethylene oxideNCI-C55549(RS)-3-hydroxy-1,2-epoxypropane

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:30966
ChEMBL:CHEMBL1530150
EPA DTXSID:DTXSID4020666
PubMed:37926403
PubMed:34461274
PubMed:33187795
PubMed:33150645
PubMed:33150595
PubMed:27884059
PubMed:24915197
PubMed:24395379
PubMed:22921352
PubMed:22920950
PubMed:22889899
PubMed:22863850

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 556-52-5

1 total

Annex

Entry

660

2,3-Epoxypropan-1-ol (Glycidol)

209-128-3

CMR

How CAS 556-52-5 is used on this site

CAS 556-52-5 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 556-52-5 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 556-52-5 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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Tools & next steps

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