... F220 3 for bonded abrasive and blasting 4 best service fused Brown corundum 1) High AL2O3 content: 95%min 2) Professional ... and made into different grain size through crystal, choosing, crashing, magnetic, separating, screening, washing and acid washing, etc. 2. Specification ... the powder eg: W40, that is 320# 3. Application 1) Abrasive: Produce ceramic gring wheel, resinoid gringding wheel, Grinding ...