| 摘要 |
<p>PURPOSE: To provide a vacuum heat insulating material minimized in pressure rise and suppressed in increase in weight when used for a long time, and easy to handle. CONSTITUTION: In a vacuum heat insulating material having a covering material 2 and a filler 2 filled in the covering material 2 in which the inner part of the covering material 2 is vacuumed after the filter 3 is filled in the covering material 2, and the covering material 2 is sealed, the filter 3 is formed of a calcium silicate board, and the density of the filter 3 is set to 0.1g/cm<3> -0.05g/cm<3> .</p> |
