1. The relationship between average particle size and transparency:
 As the average particle size increases, the transparency becomes worse. This is because transparency refers to the property that an object transmits less visible light and scatters less. The optimal particle size of a powder should generally be 1/2 of the wavelength of light in the air, that is, 0.2 to 0.4 mm. Above this value, the powder's scattering ability will increase. Below this value, the powder will lose its ability to scatter light. The powder is usually a mixture of different particle sizes. The particle size is between 0.01 and 50 mm. In the system, the smaller the particle size of the matting powder, the less visible light is scattered, and a large amount of incident light passes through the light due to diffraction. Powder, so the better the transparency of the system. However, if the average particle size is too small, there are fewer particles that can play the matting effect, and the matting effect cannot be achieved. When the average particle diameter is coordinated with the thickness of the coating film, the larger the average particle diameter, the better the matting effect of the matting powder. Therefore, when selecting the matting powder, the factors of matting, transparency and coating thickness should be considered at the same time, and the matting powder that meets the requirements should be selected through a comparative test.

2. The relationship between average particle size and anti-settling property:
In the same system, if the system is left for the same time and the average particle size is large, the powder sinks at a fast rate and easily forms hard precipitates. The sedimentation rate is directly proportional to the square of the particle size, so the larger the average particle size, the faster the sedimentation rate.

3, the relationship between the average particle size and matting:
The larger the average particle size, the better the matting effect of the coating; the smaller the average particle size, the better the transparency of the coating. In the process of selecting matting powder, it is necessary to pass a series of comparative tests to make the matting and transparent properties better meet the actual use requirements.

The smaller the average particle size distribution, the higher the viscosity of the system and the lower the sedimentation rate. It is best to consider both the extinction and sedimentation factors when selecting matting powder.