Dry film lubricants encompass solid-phase coating materials — principally PTFE, molybdenum disulphide (MoS₂), graphite, and tungsten disulphide (WS₂) — applied to aerospace fasteners, bearings, sliding interfaces, and control surface components via spray, burnishing, or bonded resin systems to reduce friction and prevent fretting, galling, and cold welding in vacuum, high-temperature, or corrosive environments.
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