CAS 1 record

CAS 409-21-2

CAS 409-21-2 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 409-21-2

CAS 409-21-2PubChem CID 9863

Silicon carbide

Silicon carbide is an organosilicon compound. — ChEBI

IUPAC name: methanidylidynesilanylium

Molecular formula: CSi
Molecular weight: 40.096 g/mol
Exact mass: 39.976926534 Da
Topological polar surface area: 0.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 1
Covalent units: 1
Defined stereocentres: 0

Also known as

CarborundumSilicon monocarbideCrystarBetarundumCarborundeumTokawhiskerCarbolonNicalon

16 more reported names

SilundumSilicon carbide (SiC)Carbon silicideGreen densicCarbofrax MBetarundum UFAnnanox CKBetarundum ST-SCrystolon 37Crystolon 39Betarundum ultrafineHitaceram SC 101SC 9 (Carbide)Densic C 500Green densic GC 800KZ 3M

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External database identifiers

ChEBI:CHEBI:29390
EPA DTXSID:DTXSID5052751
PubMed:20655996
PubMed:17365031
PubMed:14646272
PubMed:14580898
PubMed:7849857

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 409-21-2

1 total

No records found for this CAS number.

How CAS 409-21-2 is used on this site

CAS 409-21-2 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 409-21-2 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.