Z 3523 (OTTO) Zinc sulphide, pieces 3-6 mm, 99.995% Cas 1314-98-3 - used as a catalyst for photocatalytic degradation of organic pollutants. Z 0135 (OTTO) Zinc sulfide powder, 10 μm, 99.99% Cas 1314-98-3 - used planar as an optical window or shaped into a lens.