Copper·Platinum·Iridium: Exploring Spark Plug Electrode Materials, Service Life Grading & High-Voltage Ionization Principle

This film analyzes the technical essence of the Spark Plug from three dimensions: Material & Mileage 1.Copper Spark Plug: Nickel-copper alloy center electrode, service life ≈ 20,000–30,000 km; suitable for older or low-performance engines. 2.Platinum Spark Plug: Platinum disc on the center electrode, service life ≈ 60,000–80,000 km; stable ignition for mid-range passenger cars. 3.Iridium Spark Plug: Iridium alloy fine-wire center electrode, service life up to 100,000+ km; fast ignition for high-performance and turbocharged engines. Operating Principle The Ignition coil generates 20,000–40,000 volts, delivered to the spark plug’s center electrode. The high voltage breaks down the air gap between center and ground electrodes, creating an ionized plasma channel and releasing a spark. This instantly ignites the compressed air-fuel mixture in the combustion chamber, driving the piston. Structural Adaptation All material types share copper-core heat conduction, alumina ceramic insulation, and resistor-type EMI suppression. However, electrode fineness (iridium: 0.4–0.6mm) and melting point (iridium >2400°C) determine their ignition efficiency and durability. With a full range of electrode materials, clear mileage grading, and a proven arc‑ionization design, we deliver reliable Engine Parts and Auto Parts to the global market.