we are one of the main manufacturer for sulphur black dyes and sodium thiosulphate from inner mongolia of China.

Our supply ability for sulphur black dyes is:30,000mts per year;and 10,000mts for sodium thiosulphate.

sodium thiosulfate pentahydrate:

purity:99%min

M.W.:248.2

insoluble matter in water:0.01%max

sulfides(in terms of Na2S):0.001%max