The 250μm fibers 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 possible fillers are stranded around the strength member into a compact and circular core.After the cable core is filled with the filling compound to protect it from water ingress,the cable is sheathed by PE material as inner sheath.After armored by non-metallic yarns,Finally,the cable is sheathed by PE sheath as outer sheath.
