7783-82-6 Usage
Physical and Chemical Properties
Chemical formula is WF6. The molecular weight is 297.84. It is colorless gas or light yellow liquid. It has strong irritant. It is poisonous, its toxicity is similar with fluorine. When the temperature is very low, it is white solid. It is soluble in organic solvents and then generate a special color. When meet water, it can decompose. In the air, it can decompose with strong smoke by moisture, and generate yellow tungstate or tungsten trioxide. Chemical properties is lively. And almost all metals (except gold and platinum) can react with it. It is also corrosive for nickel, monel and stainless steel, but Ni and stainless steel have resistance for corrosion. When dry, it is less corrosive to glass, while in moisture, it is able to react quickly. It can react strong with gaseous ammonia. Ammonia or an alkali can absorb it . It can generate double salt with alkali metal fluoride. It is soluble in benzene and other organic solvents.
[Density] 3.44×103kg/m3 (15℃, liquid)
[Melting point] 2.5℃ (5.6 × 104 Pa)
[Boiling point] 17.5℃
[Critical temperature] 171℃
[Critical pressure] 445.8kPa
[Preparation method] Metal tungsten powder and elemental fluorine can react to synthesize it directly.
[Application] (1) It is strong fluorinating agent, it can synthesize tungsten film in vapor deposition method. (2) it is used in the microelectronics industry for chemical vapor deposited tungsten silicide or tungsten, to produce a low resistance, a high melting point interconnects.
Figure 1 shows the molecular structure of tungsten hexafluoride.
Hazardous characteristics
When meet moisture, air or water, it will decompose and emit toxic and corrosive hydrogen fluoride fumes. It can cause very serious burns for skin, eyes, mucous membranes. When high concentrations expose, it can cause nausea, vomiting, abdominal pain, convulsions, kidney damage.
The above information is edited by the lookchem of Wang Xiaodong.
Storage Instructions
It shoud be packed in special cylinders and stored in a cool, ventilated coffers. Avoid direct sunlight. Keep away from heat and sources of ignition. Prevent moisture. Metal, glass should be isolated storage. "poison gas" signs should be affixed. Aviation, railway transportation is prohibited. When other combustibles on fire around, dry powder, carbon dioxide can be used to extinguish. Water can be used to cool cylinder, and then close the valve quickly.
First-aid steps
It has eye irritation and can lead to blind, eyes should continue to be rinsed, go to the hospital fast for treatment. After corrosion, skin and mucous membranes is difficult to heal, it should be washed with water, and then coated with magnesium oxide ointment or glycerol dilute ammonia, and seek medical advice.
Category
Compressed gas and liquefied.
Flammability hazard characteristics
When meet water, it can decompose into toxic hydrogen fluoride gas and tungstate.
Extinguishing agent
Water.
Occupational standards
TLV-TWA 5 mg (tungsten)/cubic meter; STEL 10 mg (tungsten)/cubic meter.
Chemical Properties
Different sources of media describe the Chemical Properties of 7783-82-6 differently. You can refer to the following data:
1. Colorless gas or light-yellow liquid.
2. Tungsten hexafluoride is a toxic, colorless gas
or a light yellow liquid.
Uses
In the electronics industry as a source of tungsten metal that connects the aluminum layers within semiconductor devices.
General Description
A toxic corrosive light yellow liquid or gas. Boiling point 67°F. Melting point 37°F. Noncombustible. Used in the manufacture of other chemicals and in the manufacture of electronics.
Air & Water Reactions
Decomposes in water giving hydrofluoric acid, another corrosive material.
Reactivity Profile
Tungsten hexafluoride emits very toxic and irritating fumes containing metallic tungsten and tungsten fluorides when heated to decomposition. Reacts violently with tetramethoxysilane [Jacob, E., Angew. Chem., 1982, 21, p. 143].
Safety Profile
A poison and corrosive
liquid or gas.
Potential Exposure
A strong halogenating agent. Used to
apply tungsten coatings to other surfaces by vapor deposition
process; making electronics and components; in the
manufacture of other chemicals.
Shipping
UN2196 Tungsten hexafluoride, Hazard Class:
2.3; Labels: 2.3-Poisonous gas, 8-Corrosive material,
Inhalation Hazard Zone B. Cylinders must be transported
in a secure upright position, in a well-ventilated truck.
Protect cylinder and labels from physical damage. The
owner of the compressed gas cylinder is the only entity
allowed by federal law (49CFR) to transport and refill
them. It is a violation of transportation regulations to refill
compressed gas cylinders without the express written permission
of the owner.
Incompatibilities
Decomposes on contact with water and
moist air, forming highly corrosive hydrofluoric acid.
Violent reaction on contact with methyl silicate.
Check Digit Verification of cas no
The CAS Registry Mumber 7783-82-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 3 respectively; the second part has 2 digits, 8 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 7783-82:
(6*7)+(5*7)+(4*8)+(3*3)+(2*8)+(1*2)=136
136 % 10 = 6
So 7783-82-6 is a valid CAS Registry Number.
InChI:InChI=1/6FH.W/h6*1H;/q;;;;;;+6/p-6/rF6W/c1-7(2,3,4,5)6
7783-82-6Relevant articles and documents
Bulgakov, R. G.,Kuleshov, S. P.,Tolstikov, G. A.,Kazakov, V. P.
, (1988)
Intercalation of WF6 in the interlayer space of multiwall carbon nanotubes - Structural and morphological aspects
Claves,Giraudet,Schouler,Gadelle,Hamwi
, p. 1 - 5 (2004)
The reactivity of multiwall carbon nanotubes toward WF6, a strong Lewis acid, has been studied. A material of nominal composition C 36WF6 has been obtained and characterized by X-ray diffraction. Intercalation between pseudo-graphitic layers has been evidenced, leading to a staging phenomenon at the nanometer scale. A structural model is proposed and the intercalation chemistry of multiwalled carbon nanotubes is discussed.
Development and implementation of industrial technologies for synthesis of fluorine compound with the application of elemental fluorine
Pashkevich,Barabanov,Maksimov
, p. 1142 - 1148 (2009/12/01)
A survey is given on the application of elemental fluorine in chemical plants and research centers of Russian Federation.
