BS EN ISO 18332-2008 defines and measures porosity in metals and Miscellaneous Inorganic Coatings. Porosity is an important indicator of coating mass and affects the physical properties and durability of coatings, such as corrosion resistance, adhesion and thermal stability. The standard details the calculation method of porosity and specifies measurement techniques for coating porosity, including the use of appropriate equipment and test procedures to ensure the accuracy and conformity of test results. By implementing this standard, the structural characteristics of coatings can be systematically evaluated, the performance and Reliability of coatings can be improved, and compliance with international quality control standards can be ensured.