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Thorium dioxide

CAS 8006-33-5

Also registered as 2 other CAS numbers

34321-99-8 · 1314-20-1

Thorium dioxide chemical structure

Concern score

Not assessed — no hazard data yet.

Thorium dioxide in plain language

What it is

Also known as Thorium oxide · Thorium dioxide suspension · Thorium(IV) oxide · Thorium(4+) dioxide · Dioxyde de thorium · Thoriumdioxid

Show all 13 names

Thorotrast · Umbrathor · dioxido de torio · thoria · thorium dioxide (sara iii) · thorium dioxide (sara 313) · thorium oxide (thoria)

What it does

Used in cosmetics as a skin-conditioning agent and a binder.

  • Skin conditioning
  • Binding
  • Conditioner
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. Thorium dioxide appears in these published regulatory listings.

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • EUCosIngActiveListed in CosIng inventory for cosmetic use.
    • Listed in CosIng inventory for cosmetic use.Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 53 composition records across product categories including Laboratory supplies, Specialty occupational products, Batteries. EPA CPDat classifies this chemical for functional uses including Softener and conditioner, Binder.
    • EPA CPDat observed this chemical in 53 composition records across product categories including Laboratory supplies, Specialty occupational products, Batteries. EPA CPDat classifies this chemical for functional uses including Softener and conditioner, Binder.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 Thorium dioxide. 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 Thorium dioxide yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

5 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EPA Chemical and Products Database

    exposure · updated March 8, 2019

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    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 Thorium dioxide in a product composition. These are source records, not Greenveil catalog products.

Source records

53

Named organisations

3

Laboratory suppliesSpecialty occupational productsBatteriesRaw materials

Typical roles

Skin conditioningBindingConditioner
See products using Thorium dioxide →