This standard specifies the form and size of thick cardboard, technical requirements, test methods, inspection rules and marking, Encasement, transportation and storage related requirements, applicable to the production of special cartons and carton internal barriers. The standard describes in detail the specifications and technical parameters of thick cardboard to ensure its performance and mass in specific applications. By citing multiple relevant standards, the test methods and quality control procedures of products are clarified, which provides a technical basis for the production and use of thick cardboard and contributes to the conformity and Reliability of products.