Factory Caustic Soda Pearls NAOH Pearls 99% is used for manufacturing of chemicals, paper, artiticial silk, soap,plastics. Factory Caustic Soda Pearls NAOH Pearls 99% Usage: It is used for the manufacture of chemicals, paper, aluminum smelting, refining tungsten, artificial silk, rayon and soap manufacturing, production of dyes, plastics, the old rubber recycling, metal sodium, water electrolysis ...