The use of ordinary grinding wheels and gauze wheels to grind marble, glass products and other materials is easy to generate heat or plug. PVA sponge grinding wheel is the most suitable. Using PVA sponge grinding wheel, high work efficiency and time saving. The grinding pressure is light, usually 3-5kg/cm2 for coarse grinding and 1-2kg/cm2 for fine grinding. Dressing of the grinding wheel: After the sponge wheel is installed on the polishing machine, the circumference can be corrected first, and then the workpiece can be polished. It can be dressed with diamond dresser, sintered grinding wheel, emery cloth (paper), etc. Storage: Store in a dry place, do not get wet. Grinding pressure: Whether the use of this product can achieve the desired effect, the grinding pressure is a very important grinding condition, you should adjust it according to the type of grinding wheel used / the material of the workpiece and the grinding method, but generally finish machining to 1-2kg/cm2, 3-5kg/cm2 for rough machining. Coolant: Generally, a dry grinding wheel does not need to be cooled, but coolant should be used in the following cases: a particularly good surface finish is desired; grinding is likely to generate high grinding heat, which is easy to cause burns; Time automatic continuous grinding. Dry grinding wheel (nwp) can be used as coolant such as kerosene, light oil, etc., but not water. Specification: Arbor size:16mm(5/8") Diameter：100mm/4inch Grit: 400# Material: Silicon Carbide, Sponge polyvinyl alcohol (PVA)