Editing Lubricant (section)

=== Solid lubricants ===
{{main|Dry lubricant}}

'''PTFE:''' [[polytetrafluoroethylene]] (PTFE) is typically used as a coating layer on, for example, cooking utensils to provide a non-stick surface. Its usable temperature range up to 350&nbsp;°C and chemical inertness make it a useful additive in special [[Grease (lubricant)|greases]], where it can function both as a thickener and a lubricant. Under extreme pressures, PTFE powder or solids is of little value as it is soft and flows away from the area of contact. Ceramic or metal or alloy lubricants must be used then.<ref>{{cite journal|title=Historical developments and new trends in tribological and solid lubricant coatings
|author1=Donnet, C.|author2=Erdemir, A.|journal=Surface and Coatings Technology|year=2004|volume=180-181|pages=76–84|doi=10.1016/j.surfcoat.2003.10.022}}</ref>

'''Inorganic solids:''' [[Graphite]], hexagonal [[boron nitride]], [[molybdenum disulfide]] and [[tungsten disulfide]] are examples of [[solid lubricant]]s. Some retain their lubricity to very high temperatures. The use of some such materials is sometimes restricted by their poor resistance to oxidation (e.g., molybdenum disulfide degrades above 350&nbsp;°C in air, but 1100&nbsp;°C in reducing environments.

'''Metal/alloy:''' Metal alloys, composites and pure metals can be used as grease additives or the sole constituents of sliding surfaces and bearings. [[Cadmium]] and [[gold]] are used for plating surfaces which gives them good corrosion resistance and sliding properties, [[Lead]], [[tin]], [[zinc]] alloys and various [[bronze]] alloys are used as sliding bearings, or their powder can be used to lubricate sliding surfaces alone.