... absorbed dampness in air. It is possible to form solvent compound with metallic ions such as Ca, Ba, Mg ... ): 5.8-7.3Water insoluble: 0.05% maxApplication: For industrial use, such as oil field, paper-making, textile, dyeing ... , detergent and soil analytical chemistry reagent. For food grade, it is mainly used as additive agent, pH ... maxF: 0.003% max 68%min Sodium Hexametaphosphate Industrial Grade