Rhodium

Rhodium is also a silvery- white metal but has a higher melting point and lower density than platinum.

Rhodium is also a silvery- white metal but has a higher melting point and lower density than platinum. It has a high reflectance and is hard and durable, and is a major component of industrial catalytic systems. Its primary use is in the automotive industry for the reduction of NOx to nitrogen. Rhodium alloyed with other PGMs is used for furnace windings, thermocouple elements, bushings for glass fibre production, electrodes for aircraft spark plugs and laboratory crucibles. Rhodium is useful as an electrical contact material as it has a low electrical resistance, a low and stable contact resistance and is highly resistant to corrosion.