The fibers，250m，are positioned in a loose tube made of a high modulus plastic. The tubes are filled with a water-resistant filling compound.A Fiber Reinforced Plastic (FRP) locates in the center of core as a non一metallic strength member. The tubes (and Hers) are stranded around the strength member into a compact and circular core. An Aluminum Polyethylene Laminate (APL) is applied around the cable core. Then the cable core is covered with a thin flame retardant inner sheath， which is filled with jelly to product it from water ingress. After a corrugated steel tape armor is applied，the cable is completed with a flame-retardant outer sheath.

　　Good mechanical and temperature performance

　　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 filling

　　4.APL moisture barrier

　　5.PSP enhancing moisture-proof

　　6.Water-blocking material