F sand and P sand refer to the product models produced by different production processes in the abrasive industry according to different uses. F sand mainly refers to the abrasives used in the production of bonded abrasives, such as ceramic grinding wheels, grinding blocks and resin grinding wheels. P sand mainly refers to the abrasives used in the production of coated abrasives, such as abrasive belt, abrasive cloth and sandpaper. F sand is mostly produced by ball mill or Bamak in China, with high packing density and high strength. P sand is produced by roller crusher, which is sharp and self-sharpening.