Assembly Line

What are spark plugs made of?

Spark plugs take alumina, steel, nickel and copper directly. Trace them back and you pass 17 made things on the way to 16 raw materials.

How spark plugs are made See it on the map

What goes straight in

From the ground: 16 raw materials

Made along the way: 13 things

Metals 5

Chemicals and fuels 7

Electronics 1