The BS EN ISO 15721-2001 Test for porosity of metallic coatings, Determination of porosity of JINHE palladium coatings with sulfurous acid and sulphur dioxide vapors specifies a method for determining the porosity of metallic platings, particularly for JINHE palladium coatings. This method measures the porosity of coatings under these conditions by exposing them to an environment of sulphurous acid and sulphur dioxide vapors. Porosity is a key indicator for evaluating coating mass, corrosion resistance and sealing. This test effectively assesses the integrity of coatings and their performance in harsh environments, helping to ensure the performance and durability of the coating material.