Cables for higher temperatures (up to 200°C) have a dielectric made from PTFE and an outer sheath made from FEP, PFA or PTFE. For higher temperatures (250°C) there are cables with a dielectric and sheath from Kapton®.
NON-MAGNETIC COAXIAL CABLES
Magnetic (magnetisable) cables consist of an inner conductor made from steel, which is only copper-plated on the outside and partly silvered. The steel center provides the cable with more tensile strength (as well as making them more cost-effective) and merely disturb the transmission properties, as the high frequency