GB/T 23262-2023 specifies test methods for key performance indicators of braided and twisted non-metallic sealing packing, including dimensional deviation, pH value, compressibility, resilience, and sealing performance. It clarifies requirements for sample preparation, testing procedures, and result processing. The standard covers physical, chemical, mechanical, and usability performance testing, providing a core basis for evaluating material quality and application reliability. The tests require various specialized instruments, such as vernier calipers for dimensional measurement, pH meters for pH testing, material testing machines for mechanical property determination, high-temperature furnaces for thermal weight loss evaluation, and dedicated sealing performance test devices. These instruments provide unified technical support for product development and production quality control in related fields.