Tungsten Trioxide, Tungsten Oxide, Dioxotungsten, Tungstic Anhydride, 1314‑35‑8

Tungsten Trioxide, Tungsten Oxide, Dioxotungsten, Tungstic Anhydride, 1314‑35‑8

TUNGSTEN TRIOXIDE (WO₃)
TUNGSTEN TRIOXIDE / TUNGSTEN OXIDE / DIOXOTUNGSTEN / TUNGSTIC ANHYDRIDE
1. PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY

2. CHEMICAL STRUCTURE
2.1. Molecular Structure
Tungsten trioxide is an inorganic compound of tungsten and oxygen. Tungsten ions (W⁶⁺) and oxide ions (O²⁻) are present in a 1:3 ratio. It has a monoclinic crystal structure at room temperature and exhibits polymorphic transformations at high temperatures. It is insoluble in water but soluble in acids and alkalis. It is known for its electrochromic properties.

Structural Features:

                    TUNGSTEN TRIOXIDE [WO₃]
                          |
                W⁶⁺ - O²⁻ Ionic/Covalent Bonds
                          |
        +----------------+----------------+
        |                |                |
    Monoclinic         Yellow Powder    Electrochromic
    Crystal Structure                   Properties

2.2. Structural Properties

3. PHYSICAL AND CHEMICAL PROPERTIES

4. PURITY GRADES

5. STABILITY AND REACTIVITY

5.1. Chemical Reactions

• Reaction with Alkalis (Tungstate Formation):
  WO₃ + 2NaOH → Na₂WO₄ + H₂O
  WO₃ + 2KOH → K₂WO₄ + H₂O

• Reaction with Acids:
  WO₃ + H₂SO₄ → WO₃·H₂O (Tungstic acid)

• Reduction (at High Temperature):
  WO₃ + 3H₂ → W + 3H₂O
  WO₃ + 3C → W + 3CO

6. APPLICATION AREAS
6.1. Metallurgy

6.2. Ceramic and Glass Industry

6.3. Electrochromic Devices

6.4. Catalyst Applications

6.5. Electronics and Sensors

6.6. Sectoral Suitability Table

7. PRODUCTION PROCESS

7.1. Major Producing Countries

8. ALTERNATIVE / SUBSTITUTE PRODUCTS

9. SAFETY AND TOXICOLOGY

9.1. GHS Classification

Signal Word: WARNING

Hazard Pictograms: GHS07 (Exclamation Mark)

10. PRECAUTIONARY STATEMENTS (P-CODES)

11. FIRST AID MEASURES

12. STORAGE AND SHELF LIFE

13. PACKAGING OPTIONS

14. TRANSPORT INFORMATION

15. REGULATORY STATUS

16. OTHER NAMES AND SYNONYMS

17. QUICK REFERENCE TABLE

18. CRITICAL WARNINGS AND BEST PRACTICES

CRITICAL WARNINGS:

• Heavy Metal Oxide: Tungsten trioxide is a heavy metal oxide; careful handling is required due to environmental and toxicological concerns.

• Incompatibility: Reacts with strong reducing agents (H₂, C) to form tungsten metal; this reaction may be exothermic.

• Powder Hazard: Fine powder form may cause respiratory tract irritation. Dust control measures must be taken.

• Alkali Reactivity: Reacts with alkalis to form tungstates; this reaction may cause uncontrolled heat generation.

• Recycling: Tungsten is a valuable metal; recovery from tungsten scrap and spent catalysts is possible.

BEST PRACTICE RECOMMENDATIONS:

• Storage:

  • Store in a cool, dry, and well-ventilated area.

  • Use moisture-proof, tightly closed containers.

  • Keep away from reducing agents and acids.

  • Store at room temperature (15-25°C).

• Handling:

  • Use in well-ventilated areas with local exhaust ventilation.

  • Use a dust mask (N95 or better), protective goggles, and gloves.

  • Avoid dust formation and inhalation.

  • Wash hands thoroughly after handling.

  • Ensure controlled conditions when working with alkalis.

  • Avoid reducing atmospheres in high-temperature processes.

• Waste Management:

  • Dispose of in accordance with local regulations at licensed disposal facilities.

  • Do not discharge into water sources.

  • For large quantities, tungsten recycling and recovery should be considered (valuable metal).

LEGAL DISCLAIMER
This Technical Data Sheet (TDS) is for informational purposes only and has been prepared based on available technical data. The user is solely responsible for determining the suitability of the product for their specific applications and for complying with all local, national, and international regulations. For complete safety, storage, handling, transport, disposal, and regulatory compliance information, the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier must be consulted. This document does not substitute professional advice. Tungsten trioxide is a critical intermediate product for tungsten metal and tungsten carbide production; as a heavy metal oxide, it requires careful handling and disposal.