Abstract: 56 CPVC (Chlorinated Polyvinyl Chloride) protective tube samples were selected for performance testing. By calculating the Relative difference ( \Delta d ) between the test results of various indicators and the standard requirements, a discussion and analysis were conducted on the existing performance issues of CPVC protective tubes. This provides reference suggestions for improving the quality of CPVC protective tubes and optimizing standards. The results showed that the current production technology can basically meet the requirements of the maximum inner diameter, maximum wall thickness, and ring stiffness of CPVC protective tubes specified in the standard. Meanwhile, it was analyzed that moderately relaxing the wall thickness requirements for CPVC protective tubes, especially the restrictions on the maximum wall thickness specified in the standard, may be a feasible measure to optimize the existing standard and enhance the performance of CPVC protective tubes. On the other hand, the non-compliance rates of density, impact resistance, and Vicat softening temperature of CPVC protective tubes are as high as 20%, 18%, and 11%, respectively, which requires targeted composition optimization and process control measures to be developed.