The relationship between abrasive cloth mesh size and surface roughness is shown in the table below. Please note that different standards and measurement methods may result in different values; the following information is for reference only:
Abrasive cloth grit | Surface roughness (Ra, unit: micrometers):
120-180 | Coarse, suitable for initial sanding;
220-320 | Medium roughness, for further sanding;
400-600 | Fine, suitable for sanding and shaping;
800-1000 | Very fine, used for sanding rough surfaces to a relatively smooth finish;
1200-1500 | Very fine, can sand surfaces to a very smooth finish;
2000-4000 | Extremely fine, suitable for polishing, making surfaces even smoother and more delicate;
5000-8000 | Fine polishing, the surface gradually develops a mirror-like shine;
10000 and above | High polishing, the surface is as bright as a mirror.
Note: The Ra value here is a commonly used surface roughness parameter, representing the arithmetic mean deviation of the profile, that is, the arithmetic mean of the absolute values of the profile deviations over a sampling length. The smaller the Ra value, the smoother the surface.
The grit number of abrasive cloth indicates the fineness of its abrasive particles. A higher grit number means finer abrasive grains, resulting in a smoother surface. When choosing abrasive cloth, the appropriate grit number should be selected based on specific sanding needs and the material of the workpiece. At the same time, attention should be paid to the pressure and uniformity when sanding with abrasive cloth in order to obtain the ideal surface roughness.
The above information is for reference only. Specific values may vary depending on different brands, manufacturing processes, and measurement methods. In practical applications, it is recommended to refer to the product manual or consult a professional for accurate information.
