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3-In-One lubricating oil. 3-in-One Oil is a general-purpose lubricating oil sold for household and do-it-yourself use. It was originally formulated in 1894 for use on bicycles, and remains a popular lubricant for their chains. Its name, given by inventor George W. Cole of New Jersey in 1894, [1] reflects the product's triple ability to "clean ...
Contrary to the other solid lubricants discussed, PTFE does not have a layered structure. The macro molecules of PTFE slip easily along each other, similar to lamellar structures. PTFE shows one of the smallest coefficients of static and dynamic friction, down to 0.04. Operating temperatures are limited to about 260 °C.
Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene, and has numerous applications because it is chemically inert. [3] The commonly known brand name of PTFE-based composition is Teflon by Chemours , [ 4 ] a spin-off from DuPont , which originally discovered the compound in 1938. [ 4 ]
However, if the PTFE particles are smaller than those apparently used in the 1980s and 1990s, then PTFE can be an effective lubricant in suspension. [14] The size of the particle and many other interrelated components of a lubricant make it difficult to make blanket statements about whether PTFE is useful or harmful.
MIL-T-27730A (an obsolete military specification still commonly used in industry in the US) requires a minimum thickness of 3.5 mils and a minimum PTFE purity of 99%. [3] The second standard, A-A-58092, [4] is a commercial grade which maintains the thickness requirement of MIL-T-27730A and adds a minimum density of 1.2 g/cm 3. [4]
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 °C and chemical inertness make it a useful additive in special greases , where it can function both as a thickener and a lubricant.
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