... taste. Sodium gluconate is widely used in textile dyeing, printing and metal surface water treatment, chelating agent, steel surface cleaning agent ... agent for glass bottle, retarder for cement, plating and alumina dyeing industries. Item Food grade Identifications Meet the specifications Purity, % 98.0-101 ... .002 Sulphate, % ≤ 0.03 Chloride, % ≤ 0.03 Reduzate, % ≤ 0.30 Tech grade gluconate 98%