1, direct burid fibre optic Cable 2,diversified products 3,6000KM outdoor cable per month 4,exported to more than 40 countrie Description 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. A Fiber Reinforced Plastic (FRP) locates in the center of core as a non-metallic strength member. The tubes (and ...