Fibers are housed in a loose tube that is made of high-modulus plastic and filled with tube filling compound. The water blocking tape is applied around the central tube. Then the tubes are armored with a corrugated steel tape (CST) logitudinally. Two parallel steel wires are embeded in the outer PE jacket.
 

Fibers are housed in a loose tube that is made of high-modulus plastic and filled with tube filling compound. The water blocking tape is applied around the central tube. Then the tubes are armored with a corrugated steel tape (CST) logitudinally. Two parallel steel wires are embeded in the outer PE jacket.
 

● Good mechanical and temperature performance
● Steel wire as the central strength member
● Hydrolysis resistant loose tube
● Fiber gel ensures critical protection of fiber
● Specially designed stranded compact structure eliminating contraction of tubes
● Rugged, durable PE jacket protects against UV radiation, fungus etc.
● Crush resistance and flexibility
● Water-blocking measures :
- Loose tube gel-filled
- 100% cable filling compound
- APL moisture barrier

The fibers are positioned in a loose tube made of high modulus plastic and filled with gel. Tubes (and fillers) are stranded around the non-metallic strength member （FRP) to form the cable core. Then an aluminum tape (APL) is armored longitudinally around the cable core, which is filled with water blocking compound. Finally a PE jacket is extruded.