... Hexasodium metaphosphate, Hexasodium salt, Metaphosphoric acid. Specs: Tech Grade: Total phosphate, as P2O5---------- 68.0% min Inactive ... Solubility-------------------------------- Qualified Water insoluble ---------------------0.05% max Food Grade: Total phosphate, as P2O5---------- 68.0% min. Inactive ... , Ba, Mg, Cu and Fe Use: 1. Technical grade: Used in such industries as oil field, paper-making ...