Abstract
Material composition of the friction clutch lining appears to have a significant influence upon the tribological characteristics of the clutch. The clutch should have stabile working characteristics, working life which is as long as possible, fulfilling in the same time environmental requirements. In order to obtain this, particular care should be given on the materIal compositIon of friction clutch lining. Experience has shown that string/impregnant ratio has significant influence. This paper shows the results of extensive experimental testing, which has been performed in AD "RUEN'. -Kocani.