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Klingspor Abrasives PS36 ( AZ-Plus ) is a stearate coated, semi-open coat Alumina Zirconia on a paper backer. Alumina Zirconia is a tough grain like Aluminum Oxide, but has a property of being hard and brittle like Silicon Carbide called "Friable." This means that when you start with 60 grit, the grain gets under pressure it breaks like an icicle, revealing a fresh new part of the grain that is still 60 grit. From here it slowly wears down like AO making it longer lasting than other ab …