The bers, 250m，are positioned in a loose tube made of a high modulus plastic. The tubes are lied with a water-resistant Iling compound.A steel wire, sometimes sheathed with polyethylene (PE) for cable with high ber count, locates in the center of core as a metallic strength member. The tubes (and Ilers) 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 ame retardant inner sheath，witch is lied with jelly to product it from water ingree.After a corrugated steel tape armor is applied，the cable is completed with a ame-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

Special sheath material ensure excellent flame-retardant performance

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