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(A) Oilon Pv^® —80—Class I 
(B) Oilon Pv^® —80-—Class II
(C) Acetal—Class I
(D) Nylon MoS₂—Class II
(E) Nylon MoS₂—Class I
(F) PTFE glass filled—Class II
(G) Oil impregnated sintered copper alloy—Class II
(H) White Metal—Class I

Class I—Grease applied externally prior to start-up.
Class II—No grease applied prior to start-up.

Test Conditions:

Velocity — 46 ft/mm. (350 RPM)
Load — 140 lbs./sq.in., addition applied at 10 mm. intervals
Dimensions of Test Specimen — 5/8” O.D. x 318” I.D. x 3/8” long
Mating Material — Steel 113ºF HR—B 90

     A comparison of frictional characteristics of various metallic and plastic materials is given in Figure 1. in some Plastic materials the coefficient of friction decreases with load, thereby greatly reducing or eliminating the stick-slip problem in the start-up of machinery.
     In recent years the properties of plastic bearing materials have been materially enhanced by the addition of fillers (such as fiber, powder, graphite and molybdenum disulfide) and composites (metal or other backings). If the cost is warranted the mechanical properties of such bearings can be dramatically improved.

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* Reproduced with the permission of TFE Industries, 148 Parkway, Kalamazoo, Michigan, 49006, from “OILON Pv^® 80 Design Guide”, p.5.

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