... filling in paint and dope.2.Raw material for mica porcelain prodecing3.Protecting coat of welding rods,conducting wires and electric cables4 ... .A filler in insulating materials of high-frequent electric waves and acid-durable products.5. ... a filler, a shelte, a lubricating substance,a drawing of patterns in plastics,7.Rubber ,asbestos products and sealing materials ...