The Effect of Time, Temperature, and Environment on the Sliding Behavior of Polytetrafluoroethylene

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Abstract
In sliding tests, a weighted sled on PTFE runner, was pulled over a PTFE track by a stationary friction force. It was found that the sliding speed was influenced by rest periods between tests and by the nature of the preceding experiment. These time effects were investigated and are described. Other sled tests were carried out with curved contacting surfaces such as a surfaces such as a cross-cylinder and a sphere-on-flat geometry. Sliding speeds of PTFE sliding against steel and against itself were measured for several stationary friction forces. Time effects were checked. Friction tests were made with a scratch tester by dragging fine diamond styli across a flat PTFE surface and the results compared with free-rolling friction. Experiments were also conducted in dry nitrogen, in air of various humidities, and in pure helium and oxygen. The results are described.

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