Official EU label nameGlossary entry 28774

THORIUM DIOXIDE

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

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Evidence gaps

Resolved identifiers

Resolved substance identity

CAS:1314-20-1

EC:215-225-1

Ingredient index records:

THORIUM DIOXIDE

Cosmetic functions: BINDING, SKIN CONDITIONING

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1 matched or reported name

THORIUM DIOXIDE

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name THORIUM DIOXIDE.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 1314-20-1

CAS 1314-20-1PubChem CID 14808

THORIUM OXIDE (ThO2)

Thorium oxide, [radioactive material, low specific activity] is a white powder. Density 9.7 g / cm3. Not soluble in water. Used in high-temperature ceramics, gas mantles, nuclear fuel, flame spraying, crucibles, non-silicia optical glass, catalysis, filaments in incandescent lamps, cathodes in electron tubes and arc-melting electrodes. — CAMEO Chemicals

IUPAC name: dioxothorium

Molecular formula: O2Th
Molecular weight: 264.036 g/mol
Exact mass: 264.02788 Da
Topological polar surface area: 34.1 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

THORIUM DIOXIDEThoriaUmbrathorThorium anhydrideThortrastDioxide, Thorium9XA7X17UQCCHEBI:37339

13 more reported names

Oxide, ThoriumRefChem:189704215-225-1Thorium(IV) oxideThO2ThorotrastThorianiteThorium-232 dioxideHSDB 6364EINECS 215-225-1UNII-9XA7X17UQCThorium oxide, >=99.0%Thorium Oxide Nanoparticle Dispersion

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External database identifiers

ChEBI:CHEBI:37339
PubMed:7586214
PubMed:1522006
PubMed:91848

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

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

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 US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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