NGK Iridium spark plugs currently represent the highest quality technical solution. They feature an iridium alloy on the centre electrode, which is welded on in a special process using a laser. The precious metal iridium is one of the hardest metals in the world. Its melting point is 2450 °C and is therefore particularly resistant to spark erosion. By using this metal, the service life is doubled on average compared to conventional spark plugs made of nickel.
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