Is SILICON safe to use in EU cosmetics?

SILICON is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Always verify against the current official CosIng database before formulating.

What other records share CAS 7440-21-3?

CAS 7440-21-3 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

How do I check if my formula contains SILICON?

Use the INCI Checker to screen a full ingredient list across selected markets, or use the substance market comparison to review this identity across all supported market datasets.

InventoryRef 9614019/04/2018

SILICON

Silicon is a metalloid element.

SILICON is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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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 Å²
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

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:27573
EPA DTXSID:DTXSID0051441
EPA DTXSID:DTXSID6052534
PubMed:39353502
PubMed:35288261
PubMed:34252510
PubMed:29886234
PubMed:26079203
PubMed:22263782
PubMed:21193387
PubMed:20439179
PubMed:15982392

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for SILICON

INCI name

SILICON

Description

Silicon is a metalloid element.

Record provenance

Inventory reference: 96140
Imported identity: SILICON
Source update: 19/04/2018

European Commission CosIng source notes

Annex records for SILICON

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Key data

CAS

7440-21-3

231-130-8 (I)

Restriction

—

Function

ABRASIVE: Removing unwanted tissue or foreign materials from various body surfaces, including mechanical tooth cleaning and/or gloss improvement.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#26071 · SILICON

Ingredients with overlapping formulation functions

SEDIMENTARY ROCK POWDERABRASIVE, ABSORBENT, BINDING

SESAMUM INDICUM SEEDABRASIVE

SILICAABRASIVE, ABSORBENT, ANTICAKING, BULKING, OPACIFYING, VISCOSITY CONTROLLING

SILICA STEARDIMONIUMPROPYL SILYLATEABRASIVE; VISCOSITY CONTROLLING

SILICON CARBIDEABRASIVE

SILKWORM FRASSABRASIVE

SILLIMANITEABRASIVE, SKIN PROTECTING

SIMMONDSIA CHINENSIS SEED EXTRACTABRASIVE, HAIR CONDITIONING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How SILICON appears in the CosIng inventory

The CosIng inventory lists SILICON as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

SILICON is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

SILICON is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, SILICON carries the following function designation(s):

ABRASIVE

CAS 7440-21-3 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for SILICON

This page reproduces the CosIng inventory entry for SILICON from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research SILICON and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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