ISO 15184-2020 "Determination of paint film Hardness by the Paints and varnish pencil method" is an international standard for the measurement of coating Hardness by using a pencil hardness tester. The standard applies to various paints, varnishes and related coatings. Hardness measurement of coatings under a certain load by pushing a standardized Hardness pencil vertically into the coating surface. Pencil hardness testing can be used to evaluate the scratch performance and durability of coatings and is important for Coating selection and quality control. The ISO 15184-2020 standard details the test operation and assessment requirements, ensuring the accuracy and comparability of measurement results. This method is particularly suitable for the determination of Hardness of smooth surface coatings, providing an effective mass assessment tool for the Coatings industry.