technical grade Content: 98% min Loss on dry: 2.0% max Reducing substances: 0.5% max Heavy metals: 0.002% max Appearance: white crystal powder Sulphate: 0.05% max it is widely used in textile dyeing, printing and metal surface water treatment, chelating agent, steel surface cleaning agent, cleaning agent for glass bottle,chelating agent for cement, plating and alumina dyeing industries.