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Clutch linings are the friction surfaces within a clutch through which torque and speed are transmitted in a force-fit manner. They are usually 4–6 mm thick and are mostly glued nowadays. Screwing or riveting is an outdated method as the friction surfaces cannot be fully worn out. The durability depends on the length of the friction time, the material and the torque to be transmitted.
Usually they are made of composite materials of graphite, ceramics and plastics, which are strengthened by composite resin.
