C 1305 (OTTO) Cadmium sulphate, 99% Cas 7790-84-3 - used in electroplating of cadmium, which is used in electronic circuits. C 1305 (OTTO) Cadmium sulphate, 99% Cas 7790-84-3 - used as a precursor for cadmium based pigments such as cadmium sulfide and pharmaceutical intermediates.