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Assay as (Na2)S2O3:- 98 % Min. 10% solution in water:- Clear Description:- White powder free from foreign particles. pH of 10 % Solution:- 6.5 To 8.5 Sulphites & Sulphates:- 0.5% maximum Iron:- Less than 10 ppm Heavy Metals:- Less than 10 ppm Standard Packing:- 25 Kg. / 50 Kg/55lbs. HDPE Bag with extra liner inside or in Jumbo bags or as required by the buyer.