The principle of the gas adsorption method for measuring the fineness of Ewende micro silica powder is based on the phenomenon of physical adsorption. Gas molecules are adsorbed on the surface of silica particles at a specific temperature and pressure. Generally, inert gases such as nitrogen are used as adsorbents. When nitrogen molecules come into contact with the surface of micro silica powder, they are adsorbed on the surface of the particles due to the van der Waals forces between the molecules.
By measuring the amount of gas adsorbed by a sample of micro silica powder under these conditions, the specific surface area of the micro silica powder is calculated. According to the inverse relationship between specific surface area and particle size, i.e. the larger the specific surface area, the smaller the particle size and the higher the fineness, the fineness of the micro silica powder is derived. For example, if the specific surface area of micro silica powder is larger, it means that its particles are finer and the fineness is better.
