The ISO 18332-2007 standard defines porosity in metals and Miscellaneous Inorganic Coatings. Porosity is one of the important parameters for coating performance evaluation. The size of porosity directly affects the corrosion resistance, durability, adhesion and thermal conductivity of coatings. This standard provides a uniform definition and basic requirements for the measurement of coating porosity, ensuring the accuracy and conformity of the Measuring method. Through this standard, manufacturers and laboratories can accurately evaluate the pore structure of coatings, which helps to optimize the formulation of coatings and improve product mass, thereby improving the practical application performance of coatings.