Platinun alloy composition for a spark plug electrode for an internal combustion engine

摘要

A platinum alloy composition for the central electrode (1) of a spark plug for a spark ignition engine, the composition further comprising in percentage by weight: about 5% to 15% iridium; and about 0.1% to 5% of an element selected from the group comprising: hafnium, zirconium, and mixtures thereof.