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BI81 is pure synthetic Bi2S3. It is isostructural with antimony (III) sulfide and both show a very similar chemical behaviour. 

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.


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