The ISO 1518-2 standard specifies a test method for the scratch resistance of Paints and varnish using a variable load method. This method quantifies the mechanical Properties and durability of coatings by gradually increasing the load applied to the scribing needle, assessing the scratch resistance of coatings under different forces, and determining their critical scratch point. The standard details the specific requirements for test equipment, sample preparation, loading procedures and result determination to ensure the accuracy and Repeatability of the test. This method is suitable for Coatings development, quality control and performance optimization, and can help identify differences in scratch resistance of coatings.