... Soda Pearls NAOH Pearls 99% is used for manufacturing of chemicals, paper, artiticial silk, soap,plastics. ... refining tungsten, artificial silk, rayon and soap manufacturing, production of dyes, plastics, the old rubber recycling, metal ... phosphate, etc. need to use a lot of caustic soda.Specification:NaOH--------------------------------------------99% minNa2CO3----------------------------------------0. ...