Crosslinked thermoplastics maintain their dimensional stability under heat because their molecular chains are linked three-dimensionally. Chemical crosslinking is achieved by applying heat and moisture. Depending on the application involved, this can also be achieved with peroxides – hydrosilicon having been a favored one for several years. The most common crosslinked thermoplastics used in cable engineering include VPE (crosslinked polyethylene) together with EVA, EBA and EFA as ethylene copolymers.