C 1311 (OTTO) Cadmium sulphide, 99.999% Cas 1306-23-6 - used for the preparation of optical devices operating in the infrared regaion of spectrum. C 1311 (OTTO) Cadmium sulphide, 99.999% Cas 1306-23-6 - used in MOCVD, sputtering and electrochemical deposition.