What is Iridium used for?

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Iridium is used to make high-performance spark plugs, high-temperature equipment like crucibles, and specialized electrical contacts due to its extreme resistance to heat and corrosion. It is also used in medical radiation therapy via its radioactive isotopes and serves as a component in some LED screens. Additionally, platinum-iridium alloys were historically used for the SI Metre Bar and in pen tips. 
Applications of Iridium

• Medical Uses:
  Radioactive isotopes of iridium, such as iridium-192, are used in brachytherapy to treat cancer by delivering radiation to tumor cells. 

• Electronics:
  Iridium is a component in LED screens and other advanced electronic devices, including cell phones and iPads. 

• Historical and Specialized Items:
  Alloys of iridium and platinum were used to make the international standard kilogram and the SI Metre Bar. These alloys are also used for pen nibs and pivot bearings. 

• Catalysis:
  Iridium compounds are used in industrial catalysis and for producing films of high purity. 

• Spark Plugs:
  Iridium's high melting point and low reactivity make it ideal for the tips of spark plugs, which must withstand extreme temperatures during fuel ignition. 
• High-Temperature Equipment:
  It is used to create crucibles and other equipment that handle liquids at very high temperatures, such as those used in growing silicon crystals. 
• Electrical Contacts:
  Its durability makes it suitable for heavy-duty and high-performance electrical contacts in various applications.