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ifriction.com comments:

More difficult to process than SBR.  Can be used alone, or in combination with phenolic resins in flexible brake linings.  Much better heat resistance than SBR, and oil resistant too.

The possibilities of varying the NBR to resin ratio are enormous.  For heavy duty applications the resin percentages will be high, producing a rigid, fade resistant product.

Acrylonitrile powder is being found in an increasing number of friction formulas.  Can reduce wear rate and improve stability in resin based formulations.  Partially cros-linked, and will flow.  Reacts with phenol and improves bonding with the formula.  5% by weight is a normal amount to include - 10% may be too much.  The adhesion characteristic makes it a particularly attractive ingredient in formulas with asbestos substitutes.  Contains no oils so it can improve fade and low/medium temperature effectiveness.  Wear tends to be better.

Included in many recently developed formulas for rolling.  Can be used in Plough and Eirich mixers rather than the slower sigma mixers usually associated with rubber containing formulas.  Improves toughness of rolled products in the green state, and resists cracking.  Contains about 5% talc.  Allowance for this should be made when formulating.