GB/T 27731-2011 "Release Paper for Sanitary Products" specifies the classification, requirements, test methods, inspection rules, packaging, transportation, and storage of release paper used for sanitary products. It is applicable to release paper used in conjunction with sanitary products such as sanitary napkins and diapers. The standard clearly defines performance indicators such as basis weight, thickness, peel force, and air permeability. It requires the paper surface to be smooth and free from defects, with consistent color and luster, and health indicators must comply with relevant safety requirements. Sample handling and measurement of various indicators refer to corresponding standards, and inspections are carried out according to sampling plans to ensure that the products meet the usage requirements of sanitary products.