Matsumi abrasive polishing material will provide your needs.

The WA fine powder is used for white alumina abrasivesand is made from melted alumina whose mass is thencrushed into fine powder. It is basically composed of "a"type corundum crystals. It is composed of 98.0% or more of Al2O3 and is second in hardness and aluminum purity to silicon carbide.It can be used in a wide range of products since it is able to maintain an even and stable distribution within the product.The WA fine powder is suited for making grinding whetstones and also as a fine-finishing on abrasive papers. Because of its superior grinding qualities, it is also suited for use as a fine-finishing on abrasive tapes, and as a wrapping material for products with low tensile strengthsuch as glass, and crystal and semiconductor crystal products. It can also be used as a filling material (filler).