Fluorocarbon, i.e. polyvinylidene fluoride, a fluorine polymer with a high degree of crystallization. From the fishing point of view, its most important features are weight, stiffness and light penetration. Thanks to this, fluorocarbon sinks better than nylon
fishing line, and its angle of refraction of sunlight is similar to that of water, and thus - it is invisible to fish.
Fluorocarbon lines are used in most fishing methods, including carp fishing. It works perfectly as leader material, which is the basis of many rigs, such as a stiff rig.