Why does CAS 62-56-6 appear in more than one EU cosmetic annex?

A substance identified by CAS 62-56-6 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 62-56-6?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 62-56-6 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 62-56-6

Q: How do I use CAS 62-56-6 for compliance screening?

Cross-reference CAS 62-56-6 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 62-56-6 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 62-56-6

CAS 62-56-6PubChem CID 2723790

Thiourea

Thiourea is the simplest member of the thiourea class, consisting of urea with the oxygen atom substituted by sulfur. It has a role as an antioxidant and a chromophore. It is a member of ureas, a member of thioureas and a one-carbon compound. It is functionally related to a urea and a carbonothioic O,O-acid. — ChEBI

IUPAC name: thiourea

Molecular formula: CH4N2S
Molecular weight: 76.12 g/mol
Exact mass: 76.00951931 Da
XLogP3: -0.8
Topological polar surface area: 84.1 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 1
Covalent units: 1
Defined stereocentres: 0

Also known as

ThiocarbamideIsothioureaSulfourea2-ThioureaPseudothioureaThiuroniumSulourea2-Thiopseudourea

16 more reported names

Thiocarbonic acid diamideUrea, thio-beta-ThiopseudoureaThiomocovinaUrea, 2-thio-Tsizp 34Pseudourea, 2-thio-ThiocarbamidThioharnstoffThiokarbamidUSAF EK-497carbonothioic diamideRCRA waste number U219CCRIS 588GYV9AM2QAGH2NC(S)NH2

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:36946
ChEMBL:CHEMBL260876
EPA DTXSID:DTXSID9021348
PubMed:38888127
PubMed:29803612
PubMed:28117934
PubMed:27427241
PubMed:26160521
PubMed:23125680
PubMed:23053959
PubMed:23043446
PubMed:23031495
PubMed:23026000
PubMed:23019480
PubMed:23019459

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 62-56-6

1 total

Annex

Entry

321

Thiourea and its derivatives, with the exception of the one listed in Annex III

200-543-5

CMR

How CAS 62-56-6 is used on this site

CAS 62-56-6 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 62-56-6 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 62-56-6 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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