1. Low cost, help to substantially bring down the cost of asbestos free friction material.
       2. Comparing with glass fibres and wollastonite, it reduces noise and judder of friction            material as well as improving the wear resistance.
       3. Comparatively low melting point makes the resin coated rock wool softer at high            temperature, which reduces the wear of rotor as well as assisting adhesion at high            temperature. So it improves the wear resistance of friction materials at high temperature.            It is the important substitute of asbestos for friction materials.