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CAS 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9

CAS 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Records for CAS 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9

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How CAS 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9 is used on this site

CAS 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9 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 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9 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 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9 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.

Use the INCI Checker to scan your full ingredient list against all EU annex entries. The checker matches by INCI name. For CAS-based matching, verify against raw material specification sheets and compare CAS numbers with the entries listed on this page.
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Tools & next steps

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Scan a full INCI list, then use CAS 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9 to cross-check any supplier documents behind the matched substances.

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Search for INCI names, aliases or related identifiers that sit alongside CAS 591-27-5/ 51-81-0 / 68239-81-6 /38171-54-9 in your documentation.

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