The mesh number of sandpaper refers to the thickness of abrasive particles on the surface of sandpaper. Specifically, the higher the mesh, the finer the abrasive particles on the surface of the sandpaper, and the rougher the other way around. The number of mesh is usually indicated by numbers, such as 80 mesh, 120 mesh, 240 mesh, 320mesh etc.

1.  Coarse mesh (such as 60 mesh, 80 mesh) : usually used for rust removal, coating removal or preliminary grinding of metal surface, suitable for occasions with low surface requirements.

2.  Medium mesh (such as 120 mesh, 180 mesh) : suitable for woodworking products, furniture grinding, can remove the surface burrs and uneven, improve the surface smoothness.

3.  Number of details (such as 240 mesh, 320 mesh and above) : suitable for polishing before automobile painting, polishing of glass and ceramic products and other fine work, can achieve high smoothness and gloss.

The selection of the appropriate number of sandpaper mesh needs to be determinat according to the the specific grinding needs and working materials. Here are some suggestions:

1. Clear the purpose of polishing  : First determine the purpose of polishing is to remove defects, rough grinding or fine polishing, which will directly affect the selection of mesh number.

2. Consider the material properties  : the hardness and wear resistance of different materials are different, and the appropriate mesh number needs to be selected. For example, for softer wood, you can choose sandpaper with a slightly higher mesh number; For harder metals, it may be necessary to choose sandpaper with a lower mesh number.

3.  Gradual transition from coarse to fine : If multi-level grinding is required, it is recommended to use coarse mesh sandpaper for preliminary grinding, and then gradually transition to fine mesh sandpaper for fine processing.

1. Keep the sandpaper clean  : In the process of use, the sandpaper will gradually accumulate dust and dust, affecting the grinding effect. Therefore, it is necessary to clean the sandpaper surface regularly to keep it in good working condition.

2. Control strength and Angle  : Maintain proper strength and Angle when polishing to avoid excessive wear or damage to the working surface. At the same time, pay attention to maintaining uniform pressure and speed to obtain better grinding results.

3.  Pay attention to safety protection  : When using sandpaper, dust or splashing debris may be produced, so you should wear protective glasses and gloves to ensure that the working environment is well ventilated.