Regarding Materials of Commutators

The commutator bush

The name is Spring Bush

Material: Spring Steel

The mica commutators including slot type,hook type,riser type,shell type.the materials including ring,bush,copper bar as below:

Steel Rings:
 
Spring Bush:
 
Copper Bar(Segment Copper):
silver-bearing copper,electrolytic copper,ROHS PASS 
 
Mica Sheet:
 
Phenolic Resin(Glass Fiber):
 
Copper Shell:
 
Glass Fiber Ring:
 
Copper Bush:
Copper No; HPb59-1,ROHS PASS