... Soda Pearls NAOH Pearls 99% is used for manufacturing of chemicals, paper, artiticial silk, soap,plastics. Factory Caustic ... Pearls 99% Usage: It is used for the manufacture of chemicals, paper, aluminum smelting, refining tungsten, artificial silk, ... inorganic salt production, preparation of borax, chromium salts, manganese salts, phosphate, etc. need to use a lot of caustic soda.Specification:NaOH ...