GB/T 46019.2-2025 "Plastics, Recycled Plastics Composition Identification, Part 2: Polypropylene (PP) (PP) Materials" is a special project specification of the recycled plastics composition identification series standards, which clarifies the composition identification methods, technical requirements and test procedures of PP recycled plastics, covering key links such as sample preparation, test analysis and result determination. The standard is applicable to the composition identification scenarios of PP recycled materials, providing a unified technical basis for production quality control, market supervision and resource recycling, helping to standardize the order of the recycled plastics industry, and promoting the recycling of plastic resources and green development.