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Friction factor as a function of the sliding distance travelled on Triboring tribometer, plane leaves RH = 50%. Highlights of the different phases. Phase 1 extends from the beginning of the test to the point where the minimum friction factor is obtained, phase 2 extends to the point where the maximum friction factor is measured, and phase 3 extends to the point where a stabilized friction factor is obtained (corresponding to the end of a test).
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