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Tungsten Disulfide Technical Information

Need the Facts, Numbers and Tolerances

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WS2 Technical Information


a) Chemical Composition (%)
Tungsten Disulfide: 99.90%
Tungsten 74.10%
Sulpher 25.80%
Impurities 0.49%

b) Physical Properties
Molecular Weight 248
Absolute Density 7.4 g/cc
Melting Point Decomposes slowly in air at 800F, 350F in inert atmosphere.

Tungsten Disulfide Powder Certificate of Analysis " Station Eight, Inc." 4/29/2012

Thickness Of Dry Film:

One layer of Impinged Tungsten Disulfide up to .5 micron
Average Range .031-.041

Thickness measured by X-ray Flourescence, XRF per ASTM-B568, 2017

Coefficient Of Friction:

Range .020-.039.

COF Measured by Pin On Disc per ASTM-G99, 2017.


Bonded to the substrate with high velocity, 990 ft/sec, ambient air as a carrier gas,
Process requires no Binders, Cure Time or VOC's.

Adhesion Test per ASTM2530,


Inert / Non-Toxic / Medical USP Class VI, Low Outgassing, LOX Compatible,

Testing by NAMSA, 8/13/2012, Lot 210292-40
Outgassing, NASA Testing. See
LOX Compatibility:NASA Marshall Flight Center, 11/22/1991

Temperatures Range:

-460F to 1200F in normal atmosphere, -360F to 2400F in hard vacuum

Tungsten Disulfide Powder Certificate of Analysis " Station Eight, Inc." 4/29/2012

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.