The NF T30-046-2020 standard specifies methods for determining the fineness of grinding of coatings, varnishes and printing inks. The standard aims to provide the coatings and inks industry with a uniform fineness of grinding test specification to evaluate the fineness and uniformity of products. The standard describes the steps for determining the particle size distribution of coatings, varnishes and printing inks using standardized equipment such as fineness of grinding meters, and gives applicable test conditions and Measurement requirements. By implementing this standard, the mass conformity of Coatings and inks products can be ensured, and their performance can be optimized, especially in terms of surface smoothness and coating uniformity during coating and printing.