Slipstick behavior

Polytetrafluoroethylene s coefficient of friction rises quickly with sliding speed (below 30 m/min. Fig. 3.26), which prevents slipstick behavior. No noise takes place even at slow speeds. Above 45 m/min, sliding velocity has little effect at combinations of pressure and velocity before the PV limit of PTFE is reached. Figure 3.27 indicates that static coefficient of friction decreases with increase in pressure. 

Because of their light weight, low coefficient of friction, absence of slipstick behavior, and ability to be molded into intricate shapes in one piece, acetal resins find use as bearings. The lowest coefficient of friction and wear of acetal resin are obtained against steel. 

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