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Tungsten Disulfide Technical Information

Need the Facts, Numbers and Tolerances

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WS2 Technical Information


A single layer of modified Tungsten Disulfide .5 microns thick
Molecular weight of 248.02
Density of 7.4 gms/cc
Hardness of 30 Rockwell C
Uniform silver-gray in color


All ferrous and non-ferrous metals and selective manmade solids and plastics.
However, the harder the substrate, the better the bond.


High velocity impingement applied at ambient air temperature.
No cure time required
No binders or additional adhesives

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 to 100,000 psi

Coefficient of Friction:

Dynamic 0.035 Static 0.07
Coefficients lower then .05 are attainable but will vary with humidity

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

outgassing chart

Material Data Safety Sheet (MSDS)

Health Hazard: 2 Fire Hazard: 0 Reactivity: 0 Specific Hazard: 0

Tungsten Disulfide is inert, non-toxic, and non-corrosive. Tungsten Disulfide is USP class VI approved.

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USP Class VI Approved

USP Class VI is the gold standard for medical-grade raw materials. Tungsten Disulfide passed USP Class VI standards. It exhibited a very low level of toxicity by passing all of the tests requirements. All procedures performed by a third party where certified to ISO 13485:2003


Restriction of Hazardous Substances (RoHS)
Registration Evaluation Authorization of Chemicals (REACh)

Tungsten Disulfide is RoHS and REACH compliant and meets all current directives and updates. WS2 meets 2011/65/EU and 2002/95/EC furthermore it is classified as inert, non-toxic and approved by the FDA for use in food processing and pharmaceuticals manufacturing. WS2 has been tested by North American Laboratories and determined it to be non-cytotoxic.

Conflict Mineral Law

It also complies with the Dodd/Frank Bill in regards to raw material sourcing. The materials are sourced in the United States from vendors which produce the necessary chemical ingredients in North America from raw materials mined and processed in North America.