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CAS 2 records

CAS 4548-53-2

CAS 4548-53-2 matches 2 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 4548-53-2
CAS 4548-53-2PubChem CID 62542

FD&C Red 4

IUPAC name
disodium;3-[(2,4-dimethyl-5-sulfonatophenyl)diazenyl]-4-hydroxynaphthalene-1-sulfonate
Molecular formula
C18H14N2Na2O7S2
Molecular weight
480.4 g/mol
Exact mass
480.00378170 Da
Topological polar surface area
176.0 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
9
Covalent units
3
Defined stereocentres
0

Also known as

RefChem:200921Ponceau SXC.I. Food Red 1Food red 1Crimson 4RFD&C Red No. 4FD & C Red no. 4C.I. Food Red 1, disodium salt
16 more reported names
CI 14700FD and C Red No. 4X3W0AM1JLXC.I. 147001-Naphthalenesulfonic acid, 3-((2,4-dimethyl-5-sulfophenyl)azo)-4-hydroxy-, disodium salt3-((2,4-Dimethyl-5-sulfophenyl)azo)-4-hydroxy-1-naphthalenesulfonic acid, disodium saltRed 4Ponceau SX Lake4R purpleMaple Ponceau SX1-Naphthalenesulfonic acid, 4-hydroxy-3-((6-sulfo-2,4-xylyl)azo)-, disodium saltDisodium 3-((2,4-dimethyl-5-sulphonatophenyl)azo)-4-hydroxynaphthalene-1-sulphonatePurple 4RHexacol Ponceau SXRed shade #24Certicol Ponceau SXS
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 4548-53-2

2 total

How CAS 4548-53-2 is used on this site

CAS 4548-53-2 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 2 EU annex records share 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 4548-53-2 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 4548-53-2 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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