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Iridium (Ir) Metal

Iridium (Ir) is the most corrosion-resistant material. It is a silvery metal that is unreactive, dense and has a high melting point. It is hard and brittle, with low ductility making it difficult to machine, form, or work. It is mainly used in platinum alloys and a 90/10 platinum-iridium alloy for the standard kilogram mass.

Purity 99.9%
Typical Applications

Iridium (Ir) is used in special alloys. It forms an alloy with osmium, used for pen tips and compass bearings. Another main use is as a hardening agent for platinum. It is also used for making crucibles and other equipment that operate at high temperatures, pivot bearings, scientific and other specialized equipment, and high-performance technically-advanced spark plugs for use in the automotive and aviation industries.

Packaging Options

Drums or to customer specifications meeting DOT regulations


Iridium (Ir) Metal TSCA (SARA Title III) Status: Listed.
For further information, please call the EPA Office of Chemical Safety and Pollution Prevention (OCSPP) at 202-564-2902.
Iridium (Ir) Metal CAS Number: 7439-88-5
Iridium (Ir) Metal UN Number: 3089

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