What material is in clutch plates?

[Lube mate]

On an oil analysis report what element would show up from the clutch wearing on a big bore Japanese dirt bike? What material are the clutch plates made from?

 

[Propflux01]

Most plates are made from either kevlar, or pressed cork, the only thing I can think of is maybe iron or tin due to the steel used on the driven plates between the friction plates.

 

[shortyb]

You may have sintered metals in the friction plates similar to semi-metallic brake pads. They have metals such as copper, aluminum, brass, bronze, iron, and magnesium to name a few. Hondas are famous for using lots of copper in their sintered friction material.

 

[Propflux01]

This is true with most aftermarket clutch plates, but 'most' stock plates are cork-based.