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CAS 7440-21-3

CAS 7440-21-3 matches 0 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 7440-21-3
CAS 7440-21-3PubChem CID 5461123

Silicon

Silicon powder, amorphous appears as a dark brown powder. Insoluble in water and denser than water. Burns readily when exposed to heat or flames, and may be difficult to extinguish. Water may not be effective in extinguishing flames. Used to make computer microchips. — CAMEO Chemicals

IUPAC name
silicon
Molecular formula
Si
Molecular weight
28.085 g/mol
Exact mass
27.976926534 Da
Topological polar surface area
0.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
0
Covalent units
1
Defined stereocentres
0

Also known as

Silicon metalDefoamer S-10Silicon, elementalSiliciumZ4152N8IUICHEBI:27573Silicon 28Elemental silicon
16 more reported names
MeteoriteSilicium MetallicumMeteorite 8133RefChem:6220CHEBI:37763231-130-8692-536-2SiSilicon-28SiliconeSilicon powdersilicon atom7440-21-3(powder)silicioSilicon dustSilicon powder, crystalline, -325 mesh
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External database identifiers

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 7440-21-3

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No records found for this CAS number.

How CAS 7440-21-3 is used on this site

CAS 7440-21-3 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 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 7440-21-3 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.