Product Identification

Product Name

Tungsten hexafluoride

Synonyms

Tungsten fluoride
Tungsten(VI) fluoride

CAS

7783-82-6

Formula

F6W

Molecular Weight

297.83999999999997

EINECS

232-029-1

RTECS

YO7720000

RTECS Class

Other

Merck

12,9946

Beilstein/Gmelin

2940 (G)

Physical and Chemical Properties

Appearance

Colorless gas or pale yellow liquid

Solubility in water

Decomposes

Melting Point

3

Boiling Point

17.5

Vapor Pressure

670 (20 C)

Density

12.9 g/cm3

Heat Of Vaporization

26.8 kJ/mol

Usage

Used in the manufacture of other chemicals and in the manufacture of electronics.

First Aid Measures

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.

Handling and Storage

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.

Hazards Identification

Ingestion

Toxic. Causes burns.

Inhalation

Toxic if inhaled, causes burns.

Skin

Causes burns.

Eyes

Lachrymator. Causes burns.

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.

UN (DOT)

2196

Exposure Controls/Personal Protection

Personal 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.

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).]

Fire Fighting Measures

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.

Accidental Release Measures

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 and Reactivity

Stability

No data.

Incompatibilities

Reacts violently with tetramethoxysilane.

Decomposition

On decomposition will produce HF.

Transport Information

UN Number

2196

Hazard Class

2.3