... acid, nonpoisonous Chemical Formula: MnO2 Molecular Weight: 86.94 Density: 5.026 g/cm3 Appearance: Black powder, soluble in acid, Insoluble ... ,Co5 ppm max5 ppm maxMo0.5ppm max0.8ppm maxAs,Sb0.5 ppm max0.5ppm maxV1ppm max1ppm maxK250ppm max250ppm maxInsoluble in HCL0 ... .55 g/cm3 Alkaline Potential1.60-1.67V/-100 mesh99.5% min99.5% min-200 mesh85% min/-325 mesh60% min95% min Packing ...