Why does CAS 75-56-9 appear in more than one EU cosmetic annex?

A substance identified by CAS 75-56-9 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 75-56-9?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 75-56-9 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 75-56-9

Q: How do I use CAS 75-56-9 for compliance screening?

Cross-reference CAS 75-56-9 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 75-56-9 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 75-56-9

CAS 75-56-9PubChem CID 6378

Propylene Oxide

1,2-epoxypropane is an epoxide that is oxirane substituted by a methyl group at position 2. It is functionally related to an oxirane. — ChEBI

IUPAC name: 2-methyloxirane

Molecular formula: C3H6O
Molecular weight: 58.08 g/mol
Exact mass: 58.041864811 Da
XLogP3: 0.0
Topological polar surface area: 12.5 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 1
Covalent units: 1
Defined stereocentres: 0

Also known as

1,2-EpoxypropaneMethyloxiranePropene oxideEpoxypropanePropyleneoxideOxirane, methyl-1,2-PROPYLENE OXIDEPropylene epoxide

16 more reported names

Methyl oxirane2,3-EpoxypropaneMethyloxacyclopropaneMethyl ethylene oxidePropane, epoxy-Oxyde de propyleneEpihydrinAD 6 (suspending agent)Ethylene oxide, methyl-Propane, 1,2-epoxy-Methylethylene oxideNCI-C50099Y4Y7NYD4BKEPA Pesticide Chemical Code 042501AI3-07541DL-1,2-EPOXYPROPANE

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:38685
ChEMBL:CHEMBL2251584
EPA DTXSID:DTXSID5021207
PubMed:23094802
PubMed:23062436
PubMed:23020648
PubMed:22931347
PubMed:22867292
PubMed:22857013
PubMed:22819793
PubMed:22797973
PubMed:22750682
PubMed:22704884
PubMed:22701695
PubMed:22701686

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 75-56-9

1 total

Annex

Entry

655

Methyloxirane (Propylene oxide)

200-879-2

CMR

How CAS 75-56-9 is used on this site

CAS 75-56-9 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 75-56-9 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 75-56-9 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.

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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