Tungsten oxide (WO3)

CAS Number: 1314-35-8

Molecular Formula: O3W

Photocatalysts & Pigment IntermediatesElectrochromic Materials & Sputtering TargetsWO3 for Electrochromic Smart WindowsYellow Tungsten Oxide for PhotocatalysisIntermediate for Tungsten Metal Powder ReductionGas Sensors based on Tungsten OxideTungsten Trioxide Thin Film Deposition

About Tungsten oxide (WO3)

Tungsten Oxide (WO₃), CAS 1314-35-8, also known as tungsten trioxide or tungstic anhydride, is a thermally stable, water-insoluble inorganic compound produced as a yellow crystalline powder with a monoclinic crystal structure at room temperature. With a density of 7.16 g/cm³, a melting point of 1,472°C, and an n-type s...

Synonyms

Tungsten oxide
Tungstic acid
Tungstentrioxide
2-Heptylmalonicacid
Tritungsten nonaoxide

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Tungsten oxide (WO3) Specifications

CAS Number

1314-35-8

Molecular Formula

O3W

Molecular Weight

231.84

IUPAC Name

trioxotungsten

Canonical SMILES

O=[W](=O)=O

InChI Key

ZNOKGRXACCSDPY-UHFFFAOYSA-N

InChI

1S/3O.W

PubChem CID

14811

EINECS Number

215-231-4

MDL Number

MFCD00011466

HSN No

28259090

CAS Number

1314-35-8

Molecular Formula

O3W

Molecular Weight

231.84

IUPAC Name

trioxotungsten

Canonical SMILES

O=[W](=O)=O

InChI Key

ZNOKGRXACCSDPY-UHFFFAOYSA-N

InChI

1S/3O.W

PubChem CID

14811

EINECS Number

215-231-4

MDL Number

MFCD00011466

HSN No

28259090

Molecular Weight

231.84

Melting Point (Experimental)

1472°C

Boiling Point (Experimental)

1700°C

Density (Experimental)

7.2 g/cm³

Physical State

Solid

Odour

Odourless

Assay

99.04%

GHS Hazard Statements

H335 (87.5%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation

GHS Hazard Statements

H413 (18.8%) May cause long-lasting harmful effects to aquatic life [Hazardous to the aquatic environment, long-term hazard]

Metallurgy & Powder Metallurgy

As a critical intermediate supplied by leading tungsten oxide manufacturers and suppliers in the USA, tungsten oxide is used for producing tungsten metal powder and tungsten carbide, which are essential for cutting tools, aerospace components, and wear-resistant industrial parts.

Electronics & Smart Materials

Tungsten oxide is widely used in electrochromic devices such as smart windows, displays, and optical coatings, where its reversible light-modulating properties support energy-efficient building systems and advanced automotive applications in the US market.

Catalysts & Chemical Processing

Functions as an active catalyst or catalyst support in petrochemical refining, hydrogenation, and environmental applications, supporting efficient chemical conversion processes in US industrial operations.

Sensors & Environmental Monitoring

Due to its n-type semiconducting properties, tungsten oxide is applied in gas sensors for detecting NOx, hydrogen, and volatile gases, supporting environmental monitoring and industrial safety systems.

Coatings, Pigments & Advanced Ceramics

Tungsten oxide is used in high-temperature coatings, ceramic pigments, and fire-resistant materials, where sourcing from trusted tungsten oxide manufacturers ensures consistent performance, thermal stability, and corrosion resistance.

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