Encyclopedia
Iridium
Iridium is a grayish-white hard metal resistant to the action of acids, including aqua regia, at normal and high temperatures.
It can be produced in the form of thin strips or wire by rolling or drawing.
Iridium is used as an alloy component applied for thermocouples, crucibles or electrodes for spark plugs in aircraft engines
Source: "Explanatory Notes to the Combined Nomenclature of Goods of the Russian Federation (HSN RF)" (prepared by the Federal Customs Service of Russia) (volume 3, sections XII - XVI, groups 64 - 84)