vulcanized fiber ---a material mede from chemically gelatinized cellulosic paper using zinc chloride as the gelatinizing agent.The paper is electric insulation. This kind of paper is used for manufacturing abrasive fibre discs, semiflexible discs , gasket of electric eqipment and so on. the normal size is in sheet or in rolls the normail thickness is 0.4mm, 0.5mm, 0.7mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm