... S, Glassy sodium, Graham's Salt, Hexasodium metaphosphate, Hexasodium salt, Metaphosphoric acid. Specs: Tech Grade: Total phosphate, as P2O5 ... ---------- 68.0% min Inactive phosphate, as P2O5 ------7.5% max ... ---------------------0.05% max Food Grade: Total phosphate, as P2O5---------- 68.0% min. Inactive phosphate, as P2O5 ------7.5% max. ...