Ceramic belts will give you about 25% more wear on steel than zirconia-alumina belts. Most of our belts have a cryolite grinding aid, which reduces friction and heat. Our belts have heavy cloth backing and taped butt joints with no bump. They provide the fastest cut and longest life on steel. Ceramic sanding belts and discs are usually orange (PS992) or purple (Bora 7 premium). They are a blend of 20-50% microcrystaline ceramic and "fused" aluminum oxide. The grain size is under 1 micron, resulting in higher density and toughness. They self sharpen by fracturing only on hard materials like steel, and require more pressure than other softer abrasives.
