Tungsten(VI) oxide

Description

Tungsten(VI) oxide · CAS 1314-35-8 · O3W. UNII 940E10M08M. Melting Point: 1472 °C; Melting Point: 1473 °C; Density: 7.2.

Identification

CAS Registry Number	1314-35-8
PubChem CID	14811
Molecular formula	O3W
IUPAC name	trioxotungsten
UNII (FDA)	940E10M08M

Computed Descriptors

Molecular Weight	231.84
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	0
Exact Mass	231.935677
Monoisotopic Mass	231.935677
Topological Polar Surface Area	51.2
Heavy Atom Count	4
Formal Charge	0
Complexity	61.8

Physical & Chemical Properties

Melting Point	1472 °C
Melting Point	1473 °C
Density	7.2
Density	7.2 @25 °C

Physical description & handling notes

• Other Solid; Dry Powder; CBI; Large Crystals
• Canary yellow solid; [Merck Index] Blue or brown odorless powder; [MSDSonline] Insoluble in water; [Hawley]
• Canary yellow, heavy powder; dark orange when heated, regaining the original color on cooling
• Yellow, rhombic crystals, or yellow-orange powder
• Insol in water; sol in caustic alkalies; very slightly sol in acids
• SLIGHTLY SOL IN HYDROFLUORIC ACID

Regulatory Status

Regulatory & Food Contact	FDA Cumulative Estimated Daily Intake (CEDI): FCS TUNGSTEN OXIDE
GHS notification summary	41.5% (333 / 803)

GHS Hazard Classification

GHS notification summary	41.5% (333 / 803)
Reported hazard statements	H302 (58.5%), H315 (57.3%), H319 (57.3%), H335 (57.3%)

Documented Uses

• Used to make tungstates (used for x-ray screens and fireproofing fabrics), alloys, and yellow pigment in ceramics; [HSDB] Used as a catalyst for synthesis of organometallic compounds; [Ullmann]
• Metal Preparation and Pouring [Category: Foundry]
• Ceramics making [Category: Hobbies]
• Mfr of tungstates which are used for x-ray screens and for fireproofing fabrics.
• To form metal by reduction; alloys; yellow pigment in ceramics
• Not Known or Reasonably Ascertainable

Synonyms

TUNGSTEN TRIOXIDE; 1314-35-8; Tungsten oxide (WO3); Tungstic anhydride; Tungstic oxide; Tungsten Blue; Tungstic acid anhydride; Wolframic acid, anhydride; CI 77901; C.I. 77901; DTXSID7032262; 940E10M08M; RefChem:1100596; 215-231-4; DTXCID5012262; Tungsten(VI) oxide

Frequently Asked Questions

What are the CAS number and molecular formula of Tungsten(VI) oxide?

CAS 1314-35-8; molecular formula O3W; molecular weight — g/mol.

What other names is Tungsten(VI) oxide known by?

TUNGSTEN TRIOXIDE, 1314-35-8, Tungsten oxide (WO3), Tungstic anhydride, Tungstic oxide, Tungsten Blue.

What is the regulatory status of Tungsten(VI) oxide?

Documented regulatory listings: FDA Cumulative Estimated Daily Intake (CEDI): FCS; TUNGSTEN OXIDE.

Is Tungsten(VI) oxide classified as hazardous?

41.5% of GHS notifications report no hazard classification (333 of 803).

What are the key physical properties of Tungsten(VI) oxide?

Melting Point: 1472 °C; Melting Point: 1473 °C; Density: 7.2; Density: 7.2 @25 °C.

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.