| 摘要 |
<p>A shielded heating element in which an electric heating wire (2) is inserted into a metal pipe (3) which is packed with an electrically insulating powder (4). The electrically insulating powder (4) contains metallic powder specifically selected to suppress the oxidation of the metallic component of the wire (2) to lengthen the working life, providing wide use in domestic and industrial fields.</p> |
