Composite Bismuth Sulfide - BI50

Is a composite based in Bi2S3, with lower density to achieve less price per volume in your formulation. 
The critical sections (high temperature, fade) show an improvement in terms of in-stop stability and NVH. In terms of wear, the disc rugosity gets reduced and so, the finishing of the rotor is very smooth, which explains its good in-stop and NVH behaviour.