Powdered iron is mixed with zirconium nitrate and can be used as a flash powder. Metal zirconium is used almost exclusively as a cladding for uranium fuel components in nuclear reactors. Also used in the manufacture of photographic flashlights, as well as corrosion-resistant containers and pipes, especially resistant to hydrochloric acid and sulfuric acid. Zirconium chemicals can be used as crosslinkers for polymers