The Process is known as synthesizing the coke and sand. As within the making of aluminum oxide abrasive, the ensuing crystalline mass is crushed and graded by particle size. Aluminum Oxide vs Silicon Carbide �?Sandpaper.com’s write-up compares the sharpness and hardness of silicon carbide to the durability of aluminum oxide, https://www.pinterest.com/pin/1001488035878378507/