Comparison of metal properties
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Iridium
Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200°(F) higher melting point and conducts electricity better than platinum (see adjacent comparison chart of metal properties). Though better, it’s not perfect, it is very expensive, and at higher temperatures it oxides, thus rendering pure iridium as an expensively poor choice for spark plug construction. However when blended with other precious metals such as Yttria, Rhodium or Platinum, you can enhance those metals' advantages with the superior strength and hardness of Iridium
For the automotive Industry
Bosch is changing what a spark plug can do by using its proprietary iridium blend in its IR Fusion spark plug. The center electrode of all Bosch IR Fusion plugs feature a patented, fused iridium and platinum center electrode, combined with exclusive surface air gap firing technology to produce a longer, more powerful spark.
For Industrial Engines
Bosch uses a Platinum-Iridium blend for an unsurpassed reliability and a greatly extended service life. Bosch has over a century of engineering experience and has developed its own Platinum-Iridium blend specifically for the industrial spark plug market. This optimum combination of precious metals can be used in either, or both, the center and ground electrodes to provide exceptional resistance to wear and a consistent level of performance under the harshest of conditions.
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