The ISO TR 21555 standard provides an overview of Paints and varnish coatings Hardness and abrasion resistance test methods. The standard summarizes a variety of test techniques for evaluating coating Hardness and abrasion resistance, covering common test methods and operating procedures, such as pencil Hardness method, ball indentation method, abrasion resistance testing, etc., to help users choose the appropriate test method to meet different application needs. The standard provides the principle, steps and scope of application of various test methods, providing systematic technical guidance for Coatings manufacturers, research institutions and quality control personnel. Through these tests, the durability, scratch resistance and abrasion resistance of coatings in actual use can be effectively evaluated, providing an important basis for the formulation optimization of coatings and product mass improvement.