Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, and chemically inert transition metal. It is a member of the platinum group.
R 1284 (OTTO) Rhodium powder, 99.9% Cas 7440-16-6 - used to cure silicones, a two part silicone where one part contains a silicon hydride and the other containing a vinyl terminated silicone are mixed.