Properties of FAST TL-.5 Tungsten Disulfide Coatings

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Composition

  • A singular layer of Tungsten Disulfide < .5 microns thick

  • Molecular weight of 248.02 g/mol

  • Density of 7.4 g/cc

  • ​Non-magnetic

  • Uniform blue-gray color

  • Resembles a rhodium finish when burnished after impingement

Compatible Substrates

  • All ferrous and non-ferrous metals and selective man-made solids and plastics.

  • However, the harder the substrate, the better the bond.

  • Can be applied to any surface finish but is most effective on surface finish of Ra 19 or less

Temperatures Range

  • -460°F to 1200°F (-273°C to 650°C) in normal atmosphere

  • -360°F to 2400°F (-188°C to 1316°C) in hard vacuum

  • Load Capacity/Pressure: ​Same as substrate up to ~350,000 psi or 2450MPa

Coefficient of Friction

  • In theory as low as Dynamic ~0.03 & Static 0.07 (under the right application conditions). Our tested results. 

Chemical Stability

  • Inert, non-toxic and non-corrosive

  • Accepts petrochemical oils and greases, synthetic oils, silicone lubricants and hydraulic fluids.

  • Does not prevent corrosion of substrate

Lox Compatibility

  • Insensitive to detonation by or in the presence of oxygen

Adhesion

  • High velocity impingement applied at ambient air temperature.

  • No cure time required

  • No binders or additional adhesives

Thickness of coating

  • Maximum of .5um​

Hardness

  • .5 to .75 Mohs' or 15.5 Vickers

Vacuum Stability

A total mass loss (TML) of 1% and collected volatile condensable material (CVCM) of .10% have been used as screening levels for rejection of spacecraft materials.

Our current averages, as certified from an independent lab:

TML = .07%

CVCM= < .01%

Tungsten Disulfide properties described above lead to numerous application uses:

  • Friction and wear reduction

  • Anti-seize / anti-galling / anti-fretting

  • Plastic mold release and flow enhancement

  • Co-lubrication enhancement in combination with oils and greases

  • Co-deposit with Ni, Cr, Ti and many other coatings

  • In place of conventional lubricants in high-vacuum/temperature situations

Since its initial development, Tungsten Disulfide has been a proven lubrication for the aerospace, plastics molding, medical device, mechanical equipment, semiconductor, and food processing industries.

For more information about the specification our WS2 coatings are compliant with, visit our AMS 2530 information page.

Purity Matters.

In addition to all of our lot-by-lot testing data, we also keep a purity report on-hand for each lot of material we use. Our current lot is analyzed to be >99.9% pure WS2. Below is an example of our purity report; we will send a full copy of the report to any current or prospective customer who requests it.

Table showing chemical purity and impurity composition of tungsten disulfide (WS2) with over 99.9% purity, details on specific impurity levels of Fe, Al, Cu, Mo, Si, Mg, Ca, Ni, Cr, H2O, and sulfur, including tungsten disulfide content specifications and impurity limits.