Potassium Permanganate (KMnO4 ) : 98% min. Cadmium : 0.5 ppm max. Chromium : 0.5 wt% max. Lead : 10 ppm Max Mercury : 0.05 ppm Max Sulfates, as SO4% by wt : 0.2 max. Water when shipped : 0.5 wt% max. Type of granulation : Crystals Insoluble residue : 0.5 wt% max.