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ifriction.com comments Made from purified alumina and is harder and more abrasive. (Typically 97% alpha alumina, 3% beta) It is less amorphous, has sharper fracture lines which impart more abrasive characteristics. Large particles will score the opposing surface. Quantities in excess of 1% (wt.) in a friction formula will wear the opposing surface and, in turn, the brake lining.
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