This standard specifies in detail the terms and definitions, classification, technical requirements, test methods, Encasement, transportation and storage requirements of acid-free paper materials for Encasement of cultural relics in collections. It applies to the development, production, use and inspection of acid-free paper materials used in the storage, display and transportation of cultural relics. In this standard, acid-free paper materials are defined as paper materials that can directly contact cultural relics and meet specific technical requirements. In addition, alkaline buffers refer to additives used to neutralize acidic substances produced by the body of cultural relics and in the environment. It is added to acid-free paper.