This standard specifies in detail the product classification, technical requirements, test methods, inspection rules and marking, Encasement, transportation and storage requirements of D113 macroporous weakly acidic acrylic cation exchange Resin. It is suitable for the production and quality control of D113 Resin to ensure that it shows good performance in the ion exchange process. The standard covers the determination methods of important indicators such as Exchange capacity, moisture density and particle size of Resin, providing detailed guidance for the mass management and application of Resin.