Why does CAS 584-84-9 appear in more than one EU cosmetic annex?

A substance identified by CAS 584-84-9 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 584-84-9?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 584-84-9 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 584-84-9

Q: How do I use CAS 584-84-9 for compliance screening?

Cross-reference CAS 584-84-9 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 584-84-9 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 584-84-9

CAS 584-84-9PubChem CID 11443

Toluene 2,4-Diisocyanate

Toluene 2,4-diisocyanate is a toluene meta-diisocyanate in which the isocyanato groups are at positions 2 and 4 relative to the methyl group on the benzene ring. It has a role as an allergen and a hapten. — ChEBI

IUPAC name: 2,4-diisocyanato-1-methylbenzene

Molecular formula: C9H6N2O2
Molecular weight: 174.16 g/mol
Exact mass: 174.042927438 Da
XLogP3: 3.9
Topological polar surface area: 58.9 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

2,4-Toluene diisocyanate2,4-DiisocyanatotolueneTolylene-2,4-diisocyanateToluene-2,4-diisocyanate2,4-Tolylene diisocyanate2,4-TDIHylene tlcBenzene, 2,4-diisocyanato-1-methyl-

16 more reported names

Di-iso-cyanatolueneToluylene-2,4-diisocyanate2,4-ToluenediisocyanateHylene TDiisocyanat-toluolMondur TDToluen-disocianatoTuluylendiisocyanatMondur TDSDesmodur T80Tolueen-diisocyanaatToluilenodwuizocyjanianMondur TD-80Nacconate IOOCresorcinol diisocyanateTolyene 2,4-diisocyanate

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:53556
ChEMBL:CHEMBL1086446
EPA DTXSID:DTXSID7026156
PubMed:41678259
PubMed:38616237
PubMed:33711354
PubMed:33075463
PubMed:31577921
PubMed:31071364
PubMed:31070765
PubMed:30517707
PubMed:30445053
PubMed:30261222
PubMed:30017638
PubMed:29940203

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 584-84-9

1 total

Annex

Entry

1119

4-Methyl-m-phenylene diisocyanate (Toluene 2,4-diisocyanate)

209-544-5

CMR

How CAS 584-84-9 is used on this site

CAS 584-84-9 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 584-84-9 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 584-84-9 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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