... are manufacture with long history 2.Anhydrous Sodium Sulfite purity 96%above 3.Best quality ,price and service for you 1 ... .We are manufacture with long history2.Anhydrous Sodium Sulfitepurity 96%above3.Best quality ,price and service for customer sodium sulfiteCAS ... crystal or crystalline powder. Specification ITEMSUPERFIRSTQUALIFIEDPURITY (Na2SO3)97.0%MIN.96% MIN.. 93.0%MIN.Fe0.003%MAX.0.005%MAX ...