This part of GB/T9966 specifies the equipment, test samples, test procedures, test results and test reports for the abrasion resistance test of natural stone. This section applies to the determination of wear resistance of natural stone. The grinding disc wear method (method A) is suitable for testing materials, such as blocks, square pavement stones, etc.; the grinding wheel grinding method (method B) is suitable for testing products, such as composite panels, marble panels after surface crystallization treatment, etc. .