... NO: 7681-57-4 white or light yellow crystalline powder sodium metabisulphite tech grade 97% is white crystalMolecular formula Na2S2O5Molecular weight 190.10CAS ... as the material of fine chemicals, or used asdeveloper; In food industry, It can be used as bleaching agent, loosening agent ... , with covering matter, avoid raining.Netwt. 25kg, 50kg, 1000kg/bag. food grade sodium metabisulphite