Comparison of Metal Properties
Fine Point Platinum-Iridium Center Electrode
Long Life Platinum-Iridium Center Electrode
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Platinum-Iridium
Bosch uses a Platinum-Iridium blend for an unsurpassed reliability and a greatly extended service life. Many associate Platinum with long life spark plugs, and is still used in some spark plug construction. Iridium however, is 6 times harder and 8 times stronger than Platinum, it has a 1,200 degree (F) higher melting point and conducts electricity better. 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. Bosch has over a century of engineering experience and has developed its own Platinum-Iridium blend. This optimum combination of precious metals can be used in either of, or both the center and ground electrodes to provide exceptional resistance to wear and a consistent level of performance under the harshest of conditions. |
