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Phenolic Brake Pistons

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K2-K6:

--- Quote from: Woodside on September 19, 2019, 08:51:35 PM ---Is that the same stuff they also made sprockets out of

--- End quote ---

I think so. Phenolic resin bonded cotton weave.  Coarse weave for strength like above,  fine weave gives more machinability and precision like the brake pistons.

Also all the brown coloured circuit boards are generally made of the same. Often called "mica"

mike the bike:
 PCBs are either fibre glass or SRBP;  synthetic resin bonded paper. Not to be confused with the cotton filled stuff that sprockets are made of.

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