A flame-retardant filling rope is a type of cable filling material that is designed to prevent or slow down the spread of fire along the length of the cable. These filling ropes are often made from materials such as halogen-free flame-retardant compounds or non-halogenated flame retardant materials.
A semi-conductive water-blocking filler rope, on the other hand, is a cable filler material that combines semi-conductive properties with the ability to prevent water ingress. These types of filler ropes are commonly used in cables where water blocking and electrical continuity are important, such as in submarine or underground power cables.