| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat-insulating warm keeping tube excellent in the easiness to execute works including insertion of a conduit, communication cables, etc. SOLUTION: The heat-insulating warm keeping tube is made of foaming material of plastics in such a way that a partitioning weir is integrally installed on the inside surface stretching in the longitudinal direction, and thereby a conduit is protected in thermal insulation.</p> |
