The TAPPI T 432 standard specifies a method for measuring the water-absorption energy of absorbent paper, which is suitable for all types of absorbent paper. The method provides a standardized test method for the paper industry by measuring the amount of water absorbed by the paper within a specified time. During the test, the paper sample is immersed in water and the water absorption is recorded for a specific time to calculate the water absorption rate. This standard is widely used in quality control, product development and performance evaluation to help ensure the water absorption effect of absorbent paper in printing, writing, cleaning and other applications, providing a scientific basis for the performance optimization of related products.