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. Then it’s wrapped with a layer of corrugated steel tape longitudinally.
Between the corrugated steel tape and the loose tube is the water-blocking material, which keeps the cable compact and watertight longitudinally.
Two parallel steel wires are placed on the two sides of the steel tape.
Finally, the cable is completed with a PE sheath.