... 4) Paper grade (ZZ): used for the packing of various types of paper and paperboard, wood pitch control agents.(5) ... as polypropylene, nylon, polyvinyl chloride, polyethylene, polystyrene and polyester type plastic filler.(6) Rubber level (AJ): for anti-adhesive ... agent.(8) Ceramic grade (TC): used for the manufacture of electrical porcelain, radio porcelain, industrial ceramics, building ceramics, daily ...