The standard is ISO 1517-1995 "Paints and varnishes surface drying test, small glass ball method". The standard specifies a method for measuring the drying time of Paints and varnishes coatings using small Glass balls, including test principles, instrumentation, operation procedures and result judgment. By spreading Glass balls on the painted surface and tapping, observe whether the coating can adhere to the spheres or leave traces, and judge the surface drying state. This method is easy to operate, suitable for rapid evaluation of surface drying performance of Coatings under specific conditions, and provides standardized technical means for Coating construction process control and drying time detection.