This standard is used to evaluate the bonding strength between fine ceramic coatings and substrates, primarily specifying the method of performing scratch tests on films typically less than 20 micrometers thick using a diamond indenter. The core testing instrument for implementing this method is the scratch tester, which quantifies bonding strength by controlling a diamond indenter to scratch the coating surface at a constant speed or with progressively increasing loads while recording signals such as the critical load (Lc) in real time. This method is applicable to coatings prepared by various deposition processes and holds significant importance for quality assessment of products in fields such as microelectronics and aerospace.