Aluminum oxide is the most commonly used abrasive.
Best-suited for general purpose deburring and blending, it is tough, economical and fracture resistant. 150 Grit 5 Inch Diameter 8-Hole Hook & Loop Sanding Paper (Ceramic Aluminum Oxide), PK 25 Commonly used on ferrous alloys, high-tensile materials and wood.. Coated discs are normally used on sanders.