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1314-35-8

Basic Information
CAS No.: 1314-35-8
Name: Tungsten trioxide
Molecular Structure:
Molecular Structure of 1314-35-8 (Tungsten trioxide)
Formula: WO3
Molecular Weight: 231.85
Synonyms: C.I. 77901;Ditungsten hexaoxide;Tritungsten nonaoxide;Tungsten oxide;Tungsten oxide(W2O6);Tungsten oxide (W3O9);Tungsten oxide (W4O12);Tungsten trioxide (WO3);Tungsten(VI) oxide;Tungstic anhydride;Tungsticoxide;Tungstic oxide (WO3);WWO 03PB;YMDS 06;
EINECS: 215-231-4
Density: 7.16 g/mL at 25 °C(lit.)
Melting Point: 1470-1475 °C
Boiling Point: ~1700oC
Solubility: Insoluble in water
Appearance: yellow to greenish-yellow powder
Hazard Symbols: HarmfulXn
Risk Codes: 22-36/37/38
Safety: 26-36-37/39
PSA: 51.21000
LogP: -0.35640
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Chemistry

IUPAC Name: Trioxotungsten
The MF of Trioxotungsten (1314-35-8) is O3W.

               
The MW of Trioxotungsten (1314-35-8) is 231.84.
Synonyms of Trioxotungsten (1314-35-8): Tungsten trioxide ; Trioxotungsten ; Tungsten, trioxo- ; Tungsten oxide violet-blue ; Tungsten oxide yellow
Form: yellow to greenish-yellow powder
Product Categories: Inorganics 
Density: 7.16 g/mL at 25 °C
Water Solubility: insoluble
Melting Point: 1473 °C 
EINECS: 215-231-4
Form: powder
Merck: 14,9817

Uses

   Trioxotungsten (1314-35-8) is tungsten metal used as raw materials.Cemented carbide used in the system, pull tungsten wire, powder metallurgy, the system x-ray screen and fire protection fabrics. Ceramics can also be used as coloring agents and analytical reagents and so on.

Production

 MnWO4FeWO4+4NaOH→2Na2WO4+Fe(OH)2Mn(OH)2
12Na2WO4+14HCl→5Na2O12WO3+14NaCI+7H2O
5Na2O12WO3+10NH4CI→5(NH4)2O12WO3+10NaCl
5(NH4)2O12WO3+10HCl+7H2O→12H2WO4+10NH4C1
H2WO4→WO3+H2O

Toxicity Data With Reference

1.    

orl-rat LDLo:840 mg/kg

    HYSAAV    Hygiene and Sanitation: English Translation of Gigiena Sanitariya. 31 (1966),197.

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

Moderately toxic by ingestion. Can react violently with ClF3, Li, Cl2. See also TUNGSTEN COMPOUNDS.
Safety information of Trioxotungsten (1314-35-8):
Hazard Codes  Xn
Risk Statements 
22  Harmful if swallowed
36/37/38  Irritating to eyes, respiratory system and skin 
Safety Statements 
26  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36/37/39  Wear suitable protective clothing, gloves and eye/face protection
RTECS  YO7760000
F  21

Standards and Recommendations

OSHA PEL: TWA 5 mg(W)/m3
ACGIH TLV: TWA 5 mg(W)/m3
NIOSH REL: TWA 5 mg(W)/m3