... competitve price, good quality, prompt shipment, supply guarantee, monthly exports1000mt. Sodium Sulfide Flake 60%minYellow Flake, iron content, 10 PPM,30PPM, 80PPM ... 00max2.00max3.00max5.00maxWater Insoluble (%)0.20max0.20max0.20max0.40max 2) UsageIt can be used in many different kinds of areas ... with domestic manufactuers,has exported it to many countries. sodium sulfide flakes, Fe 10-80PPM