Document 2q4KnN1oX0b8YKeKr2K5zbDa

Online University Page 1 of 1 Mechanical Pollution Preventionffl25a*2 Asbestos Preferer o Previous Page Page 2 of 17 Brakes and Clutches - Friction Materials Brake linings and clutch facings are known as friction materials. Since the early 1900s most brakes, clutches and some non-friction automotive materials such as head gaskets and manifold gaskets have been made with a material known as asbestos. Asbestos is a tough, sturdy material that does not bum. It's a natural occurring substance (also know as silicate of magnesium) that is dug out of the ground in the United States and Canada. After processing, it typically takes the form of tiny, virtually indestructible fibers. Because asbestos is nonflammable and a poor heat conductor, it has! been used in every part of the world for brakes and clutches. Inj environments where friction and heat are high, most materials bum up. In! contrast, asbestos products wear out slowly. When used In brake linings, ] pads and clutches, asbestos slowly wears away, and the result of that > wear appears in the form of a black or dark grey dust which collects in I and around brake drums, rotors and on the outside of wheels. i http://v^\'W.sp2.org/univ/view.DhD?cid=410&m=8&l=2&fs=l&SRSS10N=5e2d1XS1S8flc7fife8leh7r njonnnA