The ASTM D4497-10 (2018) standard test method is used to manually determine the open time of hot-melt adhesives. This test method is suitable for comparing the open time of different hot-melt adhesives to evaluate their performance in practical applications. Open time refers to the time period after sizing when the Adhesive remains tacked enough to allow the material to be positioned. This method provides users with an effective means to compare and rank the performance of different hot-melt adhesives under the same conditions, but is not suitable for actual open time measurement in a specific manufacturing operation.