The GB/T 24456-2009 standard specifies the structure, classification, material requirements, test methods, inspection rules, and requirements for marking, Encasement, transportation and storage of high-density polyethylene (PE) silicon core pipes (referred to as "silicon core pipes"). The standard is applicable to optical cables, silicon core pipes for cable protection and supporting pipe fittings in underground environments such as direct burial, pipelines and grooves, but not for outdoor direct exposure to sunlight and application scenarios where the air blowing pressure is greater than 1.2 MPa. The standard aims to ensure the performance and Reliability of silicon core pipes in various application environments.