We primarily use rhodium as an alloying agent to harden platinum in thermocouples, catalyst gauzes and other products. We also have extensive experience in making flawless pure rhodium foils for mammography x-ray machines.
Rhodium has a higher melting point (1966°C) and a lower density (12.4g/cm3) than platinum, and is resistant to acid attack. It has excellent high temperature properties and mechanical strength, and can be used unprotected in air to conditions exceeding 2000°C.
As a bulk metal it's a useful electrical contact material with a low electrical resistance, low and stable contact resistance and high corrosion resistance. It can also be used for electroplating or vacuum deposition to produce a highly reflective, hard and durable surface for optical instruments and jewellery coatings.