This standard is a comprehensive quality assessment system established by China for recycled PET plastics (bottle flakes, pellets, or chips). It follows the lifecycle concept, systematically defining the assessment principles, indicators, and their weights throughout the entire process from raw material recycling to reprocessing. It also provides corresponding verification methods and assessment organizational structures. Its core objective is to establish a unified assessment basis, guide the high-quality recycling of waste plastics, and provide a technical foundation for building China's independent recycled plastics certification system. The relevant testing work is primarily conducted using test equipment specified in other national standards. Additionally, to verify product color consistency, the specialized standard "GB/T 46442-2025 Plastics—Determination of Color Difference of Recycled Plastics" may be referenced in practice, using a spectrophotometer to quantify color difference parameters.