The fibers, 250μm，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 fiber 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, witch is filled with the filling compound to protect it from water ingress. Then，the cable is completed with a PE sheath.

　　Good mechanical and temperature performance

　　High strength loose tube that is hydrolysis resistant

　　Special tube filling compound ensure a critical protection of fiber

　　Special designed compact structure is good at preventing loose

　　tubes from shrinking

　　PE sheath protects cable from ultraviolet radiation

　　The following measures are taken to ensure the cable watertight

　　1.Steel wire used as the central strength member

　　2.Loose tube filling compound

　　3.100% cable core filling