Improvements in Performance of Vermiculite-Containing Non Asbestos Organic Brake Friction Materials

The effects of vermiculite on the structural properties and performance of a model non asbestos organic (NAO) dry brake friction material have been evaluated. The incorporation of 8%, 12%, and 20% (volume percent, V%) vermiculite has been tested. Structural tests show an 18% improvement in flexural strength. Dynamometer performance shows a significant improvement in fade pressure stability and low temperature effectiveness. Preform strength, Gogan hardness, thermal compression, and thermal expansion have also been evaluated.