S 6567 (OTTOKEMI) Sodium pyrithione, ~40% in H2O Cas 3811-73-2 - used as an industrial preservative. It is widely added to water-based fluids—such as metalworking lubricants, latex paints, adhesives, and personal care products—to prevent the growth of mold, bacteria, and algae, thereby extending product shelf life and preventing spoilage.