We are the bigger manufacturer of sodium hydrosulfite. advandced sodium formate process . We can supply the sodium hydrosulfite of 85% , 88% , 90% spec. , packing is 50kgs or 100kgs net iron drum with double inner polybags . purposes of the product : in industrial field , our “gujin ”brand sodium hydrosulfite adhibition in textile industry and dyeing , paper and pulp , kaoling clay . we can supply low dust grade and food grade of sodium hydrosulfite,too . now our product is export to many than 40 country and area . if you have interest in this product or have any questions , please do not hesitate to contact with me and I will try my best to make you satisfied ! hope that we can have cooperative chance .