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CAS 1 record

CAS 189-55-9

CAS 189-55-9 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 189-55-9
CAS 189-55-9PubChem CID 9106

Dibenzo(a,i)pyrene

Dibenzo[a,i]pyrene is an ortho- and peri-fused polycyclic arene. — ChEBI

IUPAC name
hexacyclo[10.10.2.02,7.09,23.014,19.020,24]tetracosa-1(23),2,4,6,8,10,12,14,16,18,20(24),21-dodecaene
Molecular formula
C24H14
Molecular weight
302.4 g/mol
Exact mass
302.109550447 Da
XLogP3
7.3
Topological polar surface area
0.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
0
Covalent units
1
Defined stereocentres
0

Also known as

Benzo[rst]pentapheneDibenzo[a,i]pyreneBenzo(rst)pentapheneDibenzo(b,h)pyreneDB(a,i)P3,4:9,10-Dibenzopyrene1,2:7,8-DibenzpyreneDibenz(a,i)pyrene
16 more reported names
Dibenz[a,i]pyrene1,2,7,8-DibenzopyreneRCRA waste number U0643,4:9,10-Dibenzpyrene7FMI112D18NSC-875213,4,9,10-Dibenzpyrene3,4-9,10-dibenzopyreneRefChem:132808205-877-5NSC 87521Benzo(r,s,t)pentaphene3,4,9,10-DibenzopyreneCCRIS 214HSDB 4027EINECS 205-877-5
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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 189-55-9

1 total

How CAS 189-55-9 is used on this site

CAS 189-55-9 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 189-55-9 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 189-55-9 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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