Heptahydrate Zinc Sulphate in Free Flowing Powder Form is used as micronutrient mixture for wheat, rice, gram, mustard and groundnut. Heptahydrate Zinc Sulphate is widely used in fertilizer, animal feed and as weed killer. Heptahydrate Zinc Sulphate acts as a mordant in dyeing and preservative for leather and skin. Heptahydrate Zinc Sulphate in Free Flowing Powder Form also works as an astringent.