pertinak ebonit bars are laminated fabric rods. A solid or tough material made by applying heat and pressure to a fabric lining impregnated with a synthetic resin. Laminated layer of usually cellulose paper, cotton fabric, synthetic yarn fabric or non-woven fabric. When heat and pressure are applied to the coating, a chemical reaction (polymerization) turns the coating very hard. (high pressure thermosetting in plastic laminate industry)