Description Zinc Sulfide, Powder -325 mesh, 98+%, 500g For Research & Development Not for drug, human, animal, or food use Specifications: Appearance (Color) White Appearance (Form) Powder Assay (ZnS Content) 98+% Brightness L * (Powder) Approx. 97 Sieve Residue >45 µm <0.004% Loss on Drying <0.3% Relative Scattering Power (Reference pigment TiO = 100: PVC = 17%) Approx. 56% Mercury (Hg) <10 ppm Lead (Pb) <10 ppm Chromium (Cr) <10 ppm Cadmium (Cd) <10 ppm CAS: 1314-98-3 FORMULA: ZnS