This standard specifies the technical requirements and test methods for polyvinyl chloride resin products modified by acrylate copolymers and produced via the suspension method. It is applicable to the research and development, production, and quality control of such copolymer resins. The product standard details the appearance and various physical and chemical performance indicators of the resin, and describes the corresponding procedures for sampling, testing, and inspection rules. Its objective is to provide a unified evaluation basis for materials that combine the fundamental properties of polyvinyl chloride with specific modification effects (such as improved toughness and processing rheology). In terms of testing, the standard may involve various evaluation methods. Considering its nature as a modified polyvinyl chloride resin, the relevant testing instruments may include: thermal aging test chambers for assessing thermal stability, Fourier-transform infrared spectrometers for analyzing material characteristics, and gel permeation chromatographs for determining molecular weight and its distribution.