thorium oxide

Description

thorium oxide · CAS 1314-20-1 · O2Th. UNII 9XA7X17UQC. Boiling Point: 4400 °C; Melting Point: 3390 °C; Density: 10.0.

Identification

CAS Registry Number	1314-20-1
PubChem CID	14808
Molecular formula	O2Th
IUPAC name	dioxothorium
UNII (FDA)	9XA7X17UQC

Computed Descriptors

Molecular Weight	264.036
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	264.02788
Monoisotopic Mass	264.02788
Topological Polar Surface Area	34.1
Heavy Atom Count	3
Formal Charge	0
Complexity	18.3

Physical & Chemical Properties

Boiling Point	4400 °C
Melting Point	3390 °C
Density	10.0

Physical description & handling notes

• 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.
• White powder; [CAMEO]
• White crystal powder
• White cubic crystals
• Heavy white powder
• Cubic

GHS Hazard Classification

Reported hazard statements	H301 (99.5%), H311 (99.5%), H331 (99.5%), H350 (99.5%), H373 (18.8%)

Documented Uses

• Used in high-temperature ceramics, gas mantles, nuclear fuel, flame spraying, crucibles, non-silica optical glass, catalysis, filaments in incandescent lamps, cathodes in electron tubes and arc-melting electrodes. [CAMEO] Has been used as a radiopaque material in diagnostic radiology; [Merck Index]
• Glass Manufacturing [Category: Industry]
• Ceramics (high temp), gas mantles, nuclear fuel, flame spraying, crucibles, medicine, nonsilica optical glass, catalyst, thoriated tungsten filaments
• In incandescent mantles; glass with thorium oxide has a high refractive index and a low dispersion which is useful in high-quality camera lenses and scientific equipment; as a catalyst in sulfuric acid manufacture, petroleum cracking, and in the manufacture of nitric acid from ammonia.
• Commercial mantles are made up of a mesh hood of /thorium/ oxide surrounding a flame and are used in decorative exterior lighting, gasoline lanterns for camping
• For more Uses (Complete) data for THORIUM DIOXIDE (10 total), please visit the HSDB record page.

Synonyms

THORIUM DIOXIDE; Thoria; Thorium oxide (ThO2); 1314-20-1; Umbrathor; Thorium anhydride; Thortrast; Dioxide, Thorium; 9XA7X17UQC; CHEBI:37339; Oxide, Thorium; RefChem:189704; 215-225-1; dioxothorium; Thorium(IV) oxide; ThO2

Frequently Asked Questions

What are the CAS number and molecular formula of thorium oxide?

CAS 1314-20-1; molecular formula O2Th; molecular weight — g/mol.

What other names is thorium oxide known by?

THORIUM DIOXIDE, Thoria, Thorium oxide (ThO2), 1314-20-1, Umbrathor, Thorium anhydride.

Is thorium oxide classified as hazardous?

Hazard statements reported: H301, H311, H331, H350, H373.

What are the key physical properties of thorium oxide?

Boiling Point: 4400 °C; Melting Point: 3390 °C; Density: 10.0.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.