The ASTM C1326-13 (2023) standard specifies a test method for the hardness of advanced Pottery and porcelain indentation. This method assesses the hardness of Pottery and porcelain by applying a diagonal measurement of the length of the indentation to the surface of Pottery and porcelain materials. The standard is suitable for a variety of advanced Pottery and porcelain materials, especially in the hardness determination of small areas or thin layers of materials. The standard details the test equipment, operation procedures and results analysis methods to ensure the accuracy and comparability of hardness testing results. Pottery and porcelain materials are widely used in quality control, performance evaluation and New material development.