Field fiber optic cables for special applications. PSKD fiber optic cables are lightweight and durable (max. Tensile force 2.5 kN) thanks to the use of two layers of aramid fiber reinforcement. Exceptional flexibility of cables, especially at low temperatures (a positive test of 100,000 rewinding cycles) has been achieved by using a special material such as polyurethane. The use of polyurethane in the flameproof version means that the cables can ..