Literally, the application of corundum as an agent of hardness to glaze surface are determined to the hardness of the glaze properties itself. Corundum reacts as a coating agent that allowing surface roughness rating increase. Alumina is a compound with melting point of about 2,000 °C and sp. gr. about 4.0 is making the glaze component become more durable which solidify corundum foundation. As a result; it increases 50% slip resistant rating and reducing 50% of corundum usages as well as enhancing the image printing of 20–40% of grayscale tonality.