The fibers, 250m，are positioned in a loose tube made of a high modulus plastic. The tubes are lied with a water-resistant Ring compound.A steel wire locates in the center of core as a metallic strength member.Tubes (and Hers) 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 lied with the Ring compound to protect it from water ingress.Then，the cable core is covered with a thin PE inner sheath.And a PSP is longitudinally applied over the inner sheath，the cable is covered with a PE outer sheath.After the single-steel armored，the cable is finally completed with an outer sheath.

　　Good mechanical and temperature performance

　　Single-steel ensure good performance of tensile strength

　　High strength loose tube that is hydrolysis resistant

　　Special tube filling compound ensure a critical protection of fiber

　　Crush resistance and flexibility

　　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 fillip

　　4.APL moisture barrier

　　5.PSP enhancing moisture-proof

　　6.Water-blocking material