TUNGSTEN TRIOXIDE

Synonyms. Tungsten trioxide; Tungsten oxide (WO3); C.I. 77901; Tungsten Blue; Tungsten(VI) oxide; Tungstic acid; Tungstic acid anhydride; Tungstic anhydride; Tungstic oxide; Wolframic acid anhydride; Trioxotungsten;

TUNGSTEN TRIOXIDE

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PRODUCT IDENTIFICATION

CAS RN

1314-35-8

EINECS RN

215-231-4

FORMULA

WO3

MOLE WEIGHT

231.84

H.S CODE

 2825.90.3000

SMILES

 [W](=O)(=O)=O

CLASSIFICATION

Tungsten, Metal oxide

EXTRA NOTES

Tungsten(VI) oxide, also known as tungsten trioxide or tungstic anhydride, WO3, is a chemical compound containing oxygen and the transition metal tungsten. (wikipedia)
Other RN: 1328-66-1, 12165-37-6, 12165-45-6, 12165-16-1, 12737-75-6, 30445-72-8, 160637-48-9, 530099-64-0, 611206-70-3, 627811-63-6, 1344994-39-3

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE.

yellow crystalline powder

MELTING POINT

1473 C

BOILING POINT

1700 C

DENSITY

7.16

SOLUBILITY IN WATER

Insoluble

SOLVENT SOLUBILITY

Slightly soluble in HF

VAPOR DENSITY

 

log P(octanol-water)

  

VAPOR PRESSURE

  

AUTOIGNITION TEMP

  
pK

 

REFRACTIVE INDEX

 

FLASH POINT

 

 

STABILITY AND REACTIVITY
STABILITY Stable under normal conditions.

INCOMPATIBLE MATERIALS

Strong oxidizing agents

POLYMERIZATION

Has not been reported

NFPA RATINGS

Health: 1, Flammability: 0, Reactivity: 0

 

EXTERNAL LINKS & GENERAL DESCRIPTION

USA.gov - Tungsten trioxide

Wikipedia Linking - Tungsten trioxide

Google Scholar Search - Tungsten trioxide

U.S. National Library of Medicine - Tungsten trioxide

PubChem Compound Summary - Tungsten trioxide

http://www.ncbi.nlm.nih.gov/ -  Tungsten trioxide

EPA - Substance Registry Services - Tungsten trioxide

International Tungsten Industry Association
Tungsten Trioxide (WO3) :Tungsten trioxide is almost exclusively manufactured by calcination of APT under oxidising conditions (in air). WO3 is one of the most important, highly pure intermediates for the production of other tungsten compounds including tungsten metal powder. In the latter application, it was substituted to a large extent by tungsten blue oxide. Because of its bright yellow colour it is used as a pigment in oil and water colours. It is employed in a wide variety of catalysts, most recently for the control of air pollution and industrial hygiene (DeNOx). Tungsten trioxide particles are pseudomorphous to APT; which means the particles have the same shape and size as the former APT crystals, but consist of very small WO3 grains. The yellow powder is packaged in sealed polyethylene-lined steel drums and individual packaging (20 to 50kg).

 

SALES SPECIFICATION

APPEARANCE

yellow crystalline powder

ASSAY

99.9% min

ASH

0.2% max

IMPURITY (% max)

Al<0.0005, As<0.001, Bi<0.0001, Ca<0.0005, Cd<0.0001, Co<0.0005, Cr<0.0005, Cu<0.0001, Fe<0.0005, K<0.0005, Mg<0.0003, Mn<0.0005, Mo<0.0005, Na<0.0005, Ni<0.0005, P<0.0005, Pb<0.0001, S<0.0005, Sb<0.0005, Si<0.0005, Sn<0.0001, Ti<0.0005, V<0.0005

 

TRANSPORT & REGULATORY INFORMATION

UN NO.

 

HAZARD CLASS

 

PACKING GROUP  

 

SAFETY INFORMATION

HAZARD OVERVIEW

GHS (Globally Harmonised System) Classification: Not a dangerous substance. Potential Health Effects: Eyes - May cause eye irritation. Skin - May be harmful if absorbed through skin May cause skin irritation. Inhalation - May be harmful if inhaled. May cause respiratory tract irritation. Ingestion - May be harmful if swallowed.

HAZARD CODES

 

RISK PHRASES

 

SAFETY PHRASES

 

 

PACKING

Preserve in light-resistant and well-closed containers