The surface of the electric heating pipe is usually made of stainless steel (SUS304), and the black powder can be seen when the sheath tube is used in an environment with high unit heat load or high temperature. In this case, it is recommended that the electric heating tube can no longer be used, because the phenomenon indicates that the temperature has exceeded the temperature range that the surface sheath tube of the electric heating pipe can withstand. It is recommended to use the NCF800 cartridge heater/electric heating pipe with heat-resistant steel tube sheath to avoid the surface layer falling off caused by oxidation.
