GB/T 24328.2-2009 is the second part of the series of standards for toilet paper and its products, focusing on the determination of thickness, laminated thickness and apparent density (pb). The standard clarifies the determination principle, standardizes the operation procedures such as sample preparation, instrument calibrating, and measurement procedures, and details the calculation and representation methods of the results. At the same time, it puts forward requirements for the test environment and instrument accuracy. It provides a unified standard for the scientific and accurate determination of physical parameters related to toilet paper and its products, and helps product quality control and performance evaluation.