ʻO Iridium ka metala kūpaʻa loa. ʻAʻole hiki ke hoʻoheheʻe ʻia ka iridium paʻa i nā ʻakika inorganic āpau a ʻaʻole i ʻino ʻia e nā mea hoʻoheheʻe metala ʻē aʻe. E like me nā ʻāpana metala pūʻulu platinum ʻē aʻe, hiki i nā alloys iridium ke hoʻopili paʻa i nā mea kūlohelohe a hiki ke hoʻohana ʻia ma ke ʻano he catalyst.