HDPE silicon core tube is the most advanced communication optical cable sheath tube in the world. It is extruded from HDPE high-density polyethylene at one time. ISO9001, OHSAS 18001, ISO14001, ISO45001, CE. Size: 32/26, 34/28, 40/33,46/38, 50/41, 63/54 3. CO (Certificate of Origin): China, CO could be provided by free. This material synergy protects fragile glass fibers during installation by minimizing micro-bending and absorbing. Co-extruded Silicon Core Layer The internal silicon solid lubricant is synchronizely embedded into the HDPE shell through multi-machine co-extrusion, ensuring the lubricating layer will not strip or degrade over the pipe's service life.