sodium metabisulphite tech grade 97% we are manufacturer Na2S2O5 CAS NO: ... white or light yellow crystalline powder sodium metabisulphite tech grade 97% is white crystalMolecular formula Na2S2O5Molecular weight 190 ... material of fine chemicals, or used asdeveloper; In food industry, It can be used as bleaching agent, ... , avoid raining.Netwt. 25kg, 50kg, 1000kg/bag. food grade sodium metabisulphite