M 1767 (OTTO) Mercury, metal, GR 99%+ Cas 7439-97-6 - used primarily for the manufacture of industrial chemicals or for electrical and electronic applications. M 1767 (OTTO) Mercury, metal, GR 99%+ Cas 7439-97-6 - used in producing of chlorine gas and caustic soda, and in extracting gold from ore or articles that contain gold.