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ifriction.com comments:

Glass Fiber has been used very successfully as a replacement for asbestos.  Not liked by some because of its 'low' melting point!  For most applications this is not a problem.  Some find difficulties in processing asbestos-free formulations.  Those with a modest amount of glass fiber can be difficult to pre-form.  There are several pre-forming techniques which satisfactorily handle fiberglass mixes.  These processes tend to be proprietary.

Some important points:

1) Choose a fiber with the right type of sizing to anchor fibers into the resin bond.  This assures a good life.

2) A mixing process which preserves fiber length and integrity.  This ensures good strength and flexibility.