The ISO 9117-1 standard specifies a method for determining, under standard conditions, whether paints, varnishes or related materials of single or multi-coating systems have reached a through drying state after a specified drying period. This test procedure can also be used to determine the time required to achieve this state. The standard is suitable for Coating manufacturers and researchers to evaluate the drying performance of Coatings in practical applications, ensuring coating mass and construction efficiency.