Tungsten hexafluoride

  • Tungsten(VI) fluoride
  • Tungsten fluoride
Formula
WF6
Structure
Description
Colorless gas or pale yellow liquid
Uses
Used in the manufacture of other chemicals and in the manufacture of electronics.

Registry Numbers and Inventories.
CAS
7783-82-6
EC (EINECS/ELINCS)
232-029-1
RTECS
YO7720000
RTECS class
Other
UN (DOT)
2196
Merck
12,9946
Beilstein/Gmelin
2940 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
F6W
Formula mass
297.84
Melting point, °C
3
Boiling point, °C
17.5
Vapor pressure, mmHg
670 (20 C)
Density
12.9 g/cm3
Solubility in water
Decomposes
Heat of vaporization
26.8 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors. Do not use water on material itself. Neutralize spilled material with crushed limestone, soda ash, or lime. Vapor knockdown water is corrosive or toxic and should be diked for containment. Land spill: Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash, cement powder, or commercial sorbents. Water spill: Use natural deep water pockets, excavated lagoons, or sand bag barriers to trap material at bottom. Remove trapped material with suction hoses.
Stability
No data.
Incompatibilities
Reacts violently with tetramethoxysilane.
Decomposition
On decomposition will produce HF.

Fire.
Fire fighting
Use dry chemical, dry sand, or carbon dioxide. Do not use water on material itself. If large quantities of combustibles are involved, use water in flooding quantities as spray and fog. Use water spray to knock-down vapors. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
May burn but does not ignite readily.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water. Containers may explode when heated. Ruptured cylinders may rocket.

Health.
Exposure limit(s)
NIOSH REL*: TWA 5 mg/m3 ST 10 mg/m3 [*Note: The REL also applies to other insoluble tungsten compounds (as W).]
Exposure effects
   Ingestion
Toxic. Causes burns.
   Inhalation
Toxic if inhaled, causes burns.
   Skin
Causes burns.
   Eyes
Lachrymator. Causes burns.

First aid
 
   Ingestion
Wash mouth out with water, provided that the person is conscious. Call a physician.
   Inhalation
Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2196
Response guide
Hazard class
2.3
PRTC
T
Std. Transport #
4920371