Kopthione Copper Pyrithione Powder by Kumar Organic Products acts as a biocide (antifungal, antifouling, antibacterial and antimicrobial). It belongs to a class of cyclic sulfur organo products containing sulfur atom (S) and often oxygen (O), nitrogen (N) and hydrogen (H). It is an olive to green powder. Kopthione Copper Pyrithione Powder is suitable for rubbers.