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Silicon

CAS 17375-03-0

Also registered as 10 other CAS numbers

71536-23-7 · 72516-01-9 · 72516-02-0 · 72516-03-1 · 90337-93-2 · 152284-21-4 · 157383-37-4 · 160371-18-6 · 1616351-53-1 · 7440-21-3

Silicon chemical structure

Concern score

Not assessed — no hazard data yet.

Silicon in plain language

What it is

Also known as Elemental silicon · Biosilicon · CZ-N Polished wafer · Defoamer S-10 · Metasilicon 325A · Meteorite

Show all 24 names

Meteorite 8133 · Polysilicon · SILICON (Si) · Si · Si(100) wafer · Sicomill 4C-P · Sicomill Grade 2 · Silgrain · Silicium · Silicium Metallicum · Silicon 28 · Silicon metal · Silicon powder · Silicone · Silicone Polymer/Plasticizer · silicon (si + fe = 0.95 % max) · silicon (si+fe <0.95%) · silicon atom

What it does

Used in cosmetics as an abrasive. Silicon is a metalloid element.

  • Abrasive
Is it a concern?
We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

Regulation

No restrictions found. Silicon appears in these published regulatory listings.

  • In marketed US drugs
  • Inactive ingredient in US drugs

Recorded in these product areas

  • Found in consumer products
  • Beauty
  • Cleaning
  • Industrial
  • USFDAinactive ingredient database5 entries — 3 administration routes
    • Route: ORAL; Dosage form: DROPS; Potency: NASource →
    • Route: ORAL; Dosage form: POWDER, FOR SUSPENSION; Potency: NASource →
    • Route: ORAL; Dosage form: SUSPENSION; Potency: NASource →
    • Route: TOPICAL; Dosage form: CREAM; Potency: 0.4 %w/wSource →
    • Route: TRANSDERMAL; Dosage form: FILM, EXTENDED RELEASE; Potency: NASource →
  • EUCosIngActiveSilicon is a metalloid element.
  • USEPAcommercial use observedEPA CPDat observed this chemical in 4356 composition records across product categories including Construction and building materials, Furniture and furnishings, Home maintenance. EPA CPDat classifies this chemical for functional uses including Abrasive, Filler, component of aluminum threshold options..
    • EPA CPDat observed this chemical in 4356 composition records across product categories including Construction and building materials, Furniture and furnishings, Home maintenance. EPA CPDat classifies this chemical for functional uses including Abrasive, Filler, component of aluminum threshold options..Source →
  • USFDAmarketed drug occurrenceFDA NDC lists this ingredient in 11 active drug products and 12 total products.
    • FDA NDC lists this ingredient in 11 active drug products and 12 total products.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

No expert opinion on file for Silicon. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

Evidence & sources

No graded research studies for Silicon yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

8 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated october 21, 2016

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA Inactive Ingredient Database

    regulatory · updated 2026-01-09

    Open →

  • FDA National Drug Code Directory

    regulatory · updated 2027-12-31

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.

Where it has been recorded

How often EPA CPDat has listed Silicon in a product composition. These are source records, not Greenveil catalog products.

Source records

4,356

Named organisations

6

Construction and building materialsFurniture and furnishingsHome maintenanceCons. electronics, mech. appliances, and machineryCleaning products and household careIndustrial products

Typical roles

Abrasive
See products using Silicon →

Catalog

Found in these products

Their ingredient lists include Silicon; each product's own rating depends on its whole formula, so it is shown on the product page, not here.

See all 69 →Find products without it →