Aluminum oxide, also known as corundum when it is found in its crystalline form, is second only to diamonds in terms of hardness among all substances. Because of its remarkable hardness, aluminum oxide blasting grit has become a popular option for abrasive blasting. Bauxite ore, which is used to make alumina through the Bayer process, is the source of aluminum oxide grit. The sharp, angular grit used for abrasives is created by further processing and refining this alumina Synthetic grit is a very effective abrasive media known for its strength and aggressive cutting action.