... light green, light yellow, light brown or even light red; cleavage plane was pearl gloss. Hardness Density: 2.7 ... of paper and paperboard, wood pitch control agents.(5) Plastic level (SL): for such as polypropylene, nylon, polyvinyl chloride, ... industrial ceramics, building ceramics, daily ceramics and enamel.(9) Waterproof materials level (FS): for a waterproof membrane, waterproof coatings, ...