Made from non-metallic material FRP (Fiber Reinforce Platic) with uniform circular structure/dimensions, continuous, non-conductive, unconnected throughout the entire length of the cable roll, without any defects. You can cover the cable with PE plastic if necessary to create an even roundness for the cable. This component helps prevent cables and optical fibers from being too stretched and still ensures the flexibility of the cable throughout the process from production, transportation, installation, and use.

Loose tubes are manufactured from Polybutylene Terephthalate (PBT) material, which is non-conductive. Loose tubes in a cable are color coded according to EIA/TIA-598 standards and are specified as in the table below. This loose tube contains optical fibers inside and is filled with specialized moisture-proof oil (filler). . The optical fibers are free and move easily. The diameter of the loose tube depends on the number of optical fibers in the tube. The number of optical fibers in each loose tube is specified as follows: – 6 optical fibers/loose tube for cable $< = 30 fibers, – 12 optical fibers/loose tube for cables with 36 fibers or more.

In case to form an evenly round cable core with a solid structure but the number of loose tubes is not enough to create an even roundness for the cable, use an additional filler rod (Filler Rod). This auxiliary buffer tube is made from Polyethylene (PE) plastic with a natural color that does not match the color of any liquid tube and these tubes do not contain optical fibers or any metal components, and are not electrically conductive.

The spaces between the fiber and the inner surface of the liquid tube lumen are filled with a special compound (Thixotropic Jelly Compound). This compound has the effect of preventing water and moisture penetration into the tube, helping to ensure stable transmission quality. This filler is not toxic to human health, does not affect other components in the cable as well as the color of the optical fiber. This substance is colorless, odorless, mold-free, and non-conductive. It is non-conductive and has a low coefficient of thermal expansion, ensuring it does not freeze at very low temperatures. Does not hinder the movement of fibers in loose tubes.

The cable core is waterproofed and moisture-proof using the dry cable core method (quick desiccant compound - SAP), this compound completely protects the cable core from water as well as moisture from penetrating the cable, ensuring Cable cores are always dry in all environments. The entire cable core waterproof component includes the following two components: Water swellable tape is wrapped along the outside of the entire cable core and along the length of the cable core and Water swellable yarn is wrapped around the wall. central and continuous load-bearing part throughout the cable length. These two components ensure absolute prevention of water and moisture penetration into the cable core, tape and waterproof fiber. These waterproof fibers are non-conductive, insulating, non-flammable and anti-mold.

The loose tubes are arranged sequentially along with other components such as auxiliary buffer tubes (filler tubes) if necessary and are twisted SZ in reverse along the axis of the central load-bearing fiber. The above cable core is wound with two polyester yarn binders in opposite directions, with enough tension to ensure the cable core is sturdy, maintaining the order and position of the cable components throughout the production, construction and use process. use. The braiding steps and excess fiber in the loose tube ensure that the actual fiber excess in the cable compared to the length printed on the cable is guaranteed to be ≥ 1%.

Using many Aramid yarns with very high tension resistance, adding primary reinforcement helps increase the tension resistance of the cable core as well as the cable. These additional reinforcing fibers are placed outside the waterproof tape, arranged evenly and tightly braided to the inner cable core.

Corrugated steel tape protects the cable from mechanical impacts and rodents. The tape is wound along the entire cable core with the overlap of the steel tape being at least 3 mm. The outer diameter of the steel tape overlapping part is equal to the outer diameter of the corrugated part. This steel tape is made from steel material coated with Ethylene arcylic copolymer on both sides.