General Description: Copper Pyrithione is an insoluble, olive green solid that is sold as a paste/dispersion product or powder for industrial applications. Copper Pyrithione is supported in Europe under the Biocidal Products Directive. Molecular formula:C10H8N2O2S2Cu Structural formula: HS : 2933399090 Copper Pyrithione. CAS NO: 14915-37-8 SOLID UN NO.:2811. SOLUTION UN NO.: 2810 ; Hazardous class : 6.1 Molecular weight:315.9