Cooper for commutators bars The basic material used for commutator bars is electrolyte copper with silver - CuAg. Normally,commutator bars are made of copper of the following composition: 99,9 % electrolyte copper (ECu) 0,025%-0,035% silver (Ag) 0,004% maximum oxyden content (O2 ) 0 ,001%-0,007 % phosporus (P) The hardness of copper bars is 95-105 Brinell (HB).On your special request,we also use copper with a higher content of silver up to 0.1% Ag.

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Insulation between bars The basic material is remicanite. Remicanite is made of splittings of raw mica which are bound to plates of uniform thickness by means of SHELLAC or epoxy resin.

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Moulding compound By the molding compound,the commutator parts are insulated and bound into a homogenous body. The molding compound is exposed to the mechanical and considerable thermal and electrical loads. Therefore, the quality of commutators primarily depends on the selection of the corect molding compound. We use compounds based on phenolic resins produced by BAKELITE AG. Class : F - 155°C WE ONLY USE NON-ASBESTOS MOLDING COMPOUNDS.

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Rings
Commutators can be reinforced by rings for the high speed. Material of rings is steel or glass fibres.

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Bore The bore may be reinforced by a steel bush. It is better for pressing of commutator on the shaft.