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    WS2 Dry Film Lubricant

    What is Tungsten Disulphide and how its crystal structure differs from other solid lubricants?

    Tungsten Disulphide, also known as WS2, is a synthetic powder with chemical formula WS2. The microstructure of WS2 crystals is a layered hollow sphere with hexagonal crystal clusters, lamellar lattice structure, whose layers are bound by weak Van der Walls Forces. This weak binding force is easily sheared between the layers, resulting in a very low coefficient of friction. Tungsten Disulfide is one of most lubricious materials known to science.

    Why tungsten disulfide dry film lubricant is a widely accepted coating of choice?

    There are some factors that make tungsten disulfide the coating of choice in many applications including spaceflight, aerospace, military, semiconductor, medical device, automotive and more. Tungsten disulfide lubricant possesses certain significant advantages over many other classic inorganic solid lubricants; some of the attributes are listed below.

    • Components with a Tungsten Disulfide Coating can achieve a coefficient of friction as low as 0.03 dynamic and 0.07 static.
    • Tungsten Disulfide Coating is compatible with a wide temperature range, at atmospheric pressures it can withstand temperatures of -450degF to +1200degF and in vacuum atmospheres the temperature range is -305degF to +2400degF.
    • Additionally, tungsten disulfide coating can withstand extreme pressures, up to 300,000 psi in some applications. Tungsten Disulfide Coating is virtually non-outgassing in vacuum environments.

    Micro Surface Corporation exploits WS2 per Process SL-39 in the coating process

    At Micro Surface Corporation in San Jose, CA, we offer premium tungsten disulfide coating services utilizing our proprietary WS2 per Process SL-39. Tungsten Disulfide Coating is applied using state of the art equipment by our skilled technicians.

    A Brief on the Coating Process

    The tungsten disulfide coating process happens at room temperature and requires no resins, binders or curing. Once the WS2 is properly applied, it will not crack or peel and becomes a part of substrate. With dimensional build up of only 0.5 microns (0.00002”), tungsten disulphide will not affect normal machine tolerances, making it the lubricant of choice for many precision applications such as:

    • Radial ball bearings
    • Linear bearings
    • Gears
    • Assembly fasteners
    • Pistons

    Besides the above listed applications, the lubricant is applicable to many more applications where the reduction of friction and wear, elimination of galling and fretting and service life extension are desirable.

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    Coating Specifications

    Appearance Rhodium
    Silver Grey
    Substrates All ferrous or non-ferrous metal
    Man-made solids & plastics
    Coefficient of Friction Dynamic 0.030
    Static 0.070
    Non Stick Excellent
    Food Contact No
    RC Scale 1.0 to 1.5
    Flexibility Excellent
    Applied Thickness 0.00002 Inch
    Applications Chucks, Collets and Tools
    Circuit Breakers and Switches
    Compressors and Rheostats
    Cryogenic Pumps
    Electrical Connectors
    Engine and Drive Train Parts
    High Vacuum Applications
    Machine tools, Pins, Taps
    Magnetic Heads
    Pilot Valves, Chain Saws
    Rubber Gaskets, "O" Ring Seals
    Seamer Rolls
    Slide Mechanisms
    Cure Time No cure time is required when applied at ambient temperature
    Compliances Military Spec DOD-L-85645

    Environmental Specifications

    Relative Abrasion Resistance Low
    Relative Load Carrying Same as substrate up to 100,000 PSI
    5% Salt Spray Rating Impervious to Fuels,Solvents Minor Decay
    Ambient Temperature Range -273 to 650 ºC
    Vacuum Temperature Range -188 to 1316°C at 10-14 Torr
    Relative Chemical Resistance 1.0 to 1.5
    Chemical Stability Good
    Vacuum Environment Inert, non-toxic, corrosion resistant
    Lox Compatibility -188°C(-350°F) to 1316°C (2400°F) temperatures at 10-14 Torr
    Corrosion Resistance Insensitive to detonation by or in the presence of oxygen
    Compliances Minor delay of corrosion Will not prevent corrosion of substrate

    Material Specifications

    Composition Modified Tungsten Disulfide (WS2) in Lamellar Form
    Carrier High velocity refrigerated air, no binders or adhesives
    Adhesion Mechanical (Molecular Interlock)
    Magnetism Non-magnetic
    Hardness Approximately 30 Rockwell C
    Molecular Weight 248.02
    Density 7.4 gms/cc

    WS2 Chart

    Friction as a function of pressureComparitive oxidation rates
    Coefficient of friction vs Temperature in Air
    Coefficient of friction vs Temperature in Argon