The fibres, either of single-mode or multimode type, are positioned in a loose tube made of a high modulus plastic. The tubes are filled with a water-resistant filling compound. A steel wire sometimes sheathed with polyethylene (PE) for cable with high fibre count, locates in the center of core as a metallic strength member. Tubes (and fillers) are stranded around the strength member into a compact and circular cable core. An Aluminum Polyethylene Laminate (APL) is applied around the cable core, which is filled with the filing compound to protect it from water-ingress. Then, the cable is completed with a PE sheath.

Characteristics
1. Accurate fibre excess length ensures good mechanical and temperature performance
2. High strength loose tube that is hydrolysis resistant and special tube filling compound ensure a critical protection of fibre
3. Specially designed compact structure is good at preventing loose tubes from shrinking
4. The following measures are taken to ensure the cable watertight:
Steel wire used as the central strength member
Loose tube filing compound
100% cable core filling
APL moisture barrier
Application: Duct/Aerial