タイトルまたは説明

(1)To ensure the spark plug can endure high temperature, pressure and vibration, we use corundum and porcelain for insulation.
(2)The central electrode of spark plug is made of copper surrounded by nickel so that it is great in conducting heat and electricity and less in building up carbon.
(3) Using electrical heat to seal up the edges of the shell has made the inside completely air free. Meanwhile, we put the nickel coating on the outside to fight corrosion.