... Gurantee purity 99%. 4.SGS,BV passed caustic soda pearl industrial grade 96%/99% 1. PropertiesProduct name: Caustic Soda Flake ... softening and treatment, refining petroleum products, in sanitation, and hygiene products, and in the food and drug industry, etc.3. Specifications:Industrial ... ability 300-400mt each day.caustic soda pearl industrial gradeCAUSTIC SODA PEARL industrial grade 96%/99%