Tungsten Disulfide Facts

Tungsten disulfide (WS2) is one of the most lubricous materials known to science. With Coefficient of Friction at 0.03, it offers excellent dry lubricity unmatched to any other substance. It can also be used in high temperature and high pressure applications. It offers temperature resistance from -450o F (-270o C) to 1200o F (650o C) in normal atmosphere and from -305o F (-188o C) to 2400o F (1316o C) in Vacuum. Load bearing property of coated film is extremely high at 300,000 psi.

Tungsten disulfide facts can be used instead of molybdenum disulfide (MoS2) and Graphite in almost all applications, and even more. Molybdenum and Tungsten are from same chemical family. Tungsten is heavier and more stable. Molybdenum Disulfide (Also known as Moly Disulfide) till now has been extremely popular due to cheaper price, easier availability and strong and innovative marketing. Tungsten Disulfide is not new chemical and has been around as long as Moly, and is used extensively by NASA, military, aerospace and automotive industry.

Till few years ago, price was tungsten disulfide facts were almost 10 times that of Molybdenum Disulfide. But since then price of molybdenum disulfide has doubled every six months. Now the prices of both chemicals are within comparable range. Now, it makes more economic sense to use superior dry lubricant (Tungsten Disulfide) and improve the quality and competitiveness of final product.

Tungsten disulfide facts offer excellent lubrication under extreme conditions of Load, Vacuum and Temperature. The properties show that tungsten disulfide facts offer excellent thermal stability and oxidation resistance at higher temperatures. WS2 has thermal stability advantage of 93oC (200oF) over MoS2. Coefficient of Friction of WS2 actually reduces at higher loads.

Tungsten Disulfide Physical and Technical Properties
Tungsten disulfide facts -1 Color: Silver Gray
Tungsten disulfide facts -2 Appearances: Crystalline Solid
Tungsten disulfide facts -3 Melting Points: 1250℃, 1260℃ (decomposes)
Tungsten disulfide facts -4 Densities: 7500 kg/m3
Tungsten disulfide facts -5 Molecular Weights: 248
Tungsten disulfide facts -6 Coefficient of Friction （COF）
Tungsten disulfide facts -7 Thermal Stability in Air: COF<0.1 till 1100℉ (594℃)
Tungsten disulfide facts -8 Thermal Stability in Argon: COF<0.1 till 1500℉ (815℃)
Tungsten disulfide facts -9 Chemical Disabilities: Inert Substance, Non-Toxic
Tungsten disulfide facts -10 Corrosion Stabilities: Can sloe down the corrosion rate, but can not fully prevent substrate corrosion
Tungsten disulfide facts -11 Coatable Substrates: Iron, Steel, Aluminum, Copper, other Metals, Plastics and Manmade Solids
Tungsten disulfide facts -12 Compatibilities: Oil, Solvent, Paint, Fuel

Tungsten Disulfide Facts- Product performance
Nanometer WS2 is one performance extremely fine new solid lubrication material, is not only suitable for the general lubrication condition, but may also use in the high temperature, the high pressure, the perfect vacuum, the high load, having the radiation and the corrosive medium working conditions; Because the WS2 bunch the bunch of internal arrangement produces magnetism, can a better adsorption moreover be able to form nanometer protection lubricant film in the greasing in the metal surface in the metal surface; WS2 has the minimum friction coefficient (approximately is 0.03), may mix in the metal powder as the chemical additive enhances the metal powder and causes it under high speed friction condition coherence to obtain the stable rubbing factor; Nanometer level's WS2 has the good oxidation resistance, may join as the chemical additive to the lubricating oil (fat), can enhance the lubricating oil effectively (fat) the ep performance and anti-rubs the anti-friction performance; Joins a nanometer level in the casting process WS2 to be able to enable the mold metal to have certain self lubrication performance, has the extremely good adsorptive capacity to the metal surface, may with the oil class, the fats match the tungsten disulfide oil emulsion, the tungsten disulfide grease, the tungsten disulfide wax and other solid Run slide and the lubricant film.

As a solid lubricant, tungsten disulfide is better than molybdenum sulfide. Its lubrication characteristics are as follows:
Tungsten disulfide facts -1 Low friction coefficient (0.03), anti-pressure and anti-oxidation (in air decompose at 4500 C and completely at 6500 C; in vacuum decompose at 11000 C and completely at 20000 C). Tungsten disulfide facts can be used at high temperature, high pressure, high vacuum, high load, high rotating speed, ultra-low temperature, and high radiation and corrosion conditions.

Tungsten disulfide facts -2  Strong absorbability on metal surface, can be added into plastic to make lubricant or mixed with volatility oil and spray on the surface of mould to prolong the lifetime of mould and increase the degree of finish.

Tungsten disulfide facts -3 Tungsten disulfide powder can compose with oil or tallow to form lubrication oil, ointment, wax or other solid lubrication block and membrane.

Besides above, tungsten disulfide can be used as catalyst in petrochemical industry with high cracking ability, longevity, as well as credible and stable catalytic activity.

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