PIPE SHEATHED HEATER WITH ELECTRICAL RADIANT BODY SUPPORTED IN THE PIPE WITH HIGH MELTING POINT INSULATING POWDER

摘要

is sheath heater comprises a pipe having two open ends, a pair of electrical terminals connected to a neat radiant body in the pipe, a region of electrically insulating powder having a high melting point and loaded inside the pipe to fix the heat radiant body, and a sealing member for said open end having a glass compound layer formed by a molten glass perminating into the insulating powder region at said open end.