NGK Iridium SPARK PLUG currently represent the highest quality technical solution. They feature an iridium alloy on the center electrode, which is welded 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. Using this metal, the lifespan is doubled on average compared to traditional nickel candles.

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