When sandblasting the mobile phone shell, the abrasive particle size selected will vary according to the specific needs and the material of the mobile phone shell.

In general, the commonly used size range is between 100 mesh and 240 mesh. For example, for some metal mobile phone cases, 150 mesh or 180 mesh white corundum may be used; When dealing with mobile phone cover glass, 400 mesh, 500 mesh or 600 mesh brown corundum will be used.

However, the actual selection of abrasive particle size, also need to consider the following factors:

1. Desired surface effect: finer-grained abrasives can obtain a smoother surface, while coarser abrasives may produce a more pronounced roughness or texture.

2. Mobile phone shell material: the hardness and characteristics of different materials are different, and it is necessary to choose the appropriate particle size to achieve the ideal treatment effect, while avoiding excessive damage to the shell surface.

3. Sandblasting pressure and time: Higher sandblasting pressure and longer sandblasting time may require a relatively fine abrasive to prevent excessive erosion of the surface.

Prior to sandblasting, it is recommended to conduct a small scale test to determine the best abrasive particle size and associated sandblasting parameters for a particular phone case. At the same time, it is necessary to ensure the quality of the abrasive, such as cleanliness, particle size concentration, etc., to avoid adverse effects of impurities or large particles on the mobile phone shell.