The quality of abrasives products can be affected by the following factors: ① Smoothness of the paper: Base paper smoothness will affect the smoothness of abrasive paper and sanding piece. ② Roughness (WS) of the paper: For paper with good toughness, the resin will be easily taken in during waterproof treatment. The paper will have good strength and waterproofness. The paper will be brittle when it takes too much resin while has poor waterproofness when it takes not enough. Therefore, suitable roughness (WS) is very important. ③ Paper folding endurance and tensile strength: Poor folding endurance and tensile strength will reduce the paper strength. And the base paper will break even if grains are not run out.