Do you understand the standardization work of particle testing?

ISO - International Organization for Standardization, in charge of particle measurement is the TC24 Professional Committee, which has four branches. However, except for the SC4 branch of particle testing, other branches have been inactive for many years. TC24/S24 is responsible for the formulation of standards for all particle testing and analysis methods except screening. In my country, the general standards for particle testing are mainly under the Chinese Screen Screening and Particle Sorting Method Standardization Technology under the China National Standardization Administration Committee. Committee, the China Microbeam Analysis Standardization Committee and the China Nanotechnology Standardization Committee approved in 2005. According to incomplete statistics, so far, there have been more than 30 newly released technical standards for particle testing and more than 100 product standards, mainly involving some powder industries such as powder materials and porous materials.