| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum heat insulation material capable of improving a heat insulation property, and to provide a cold storage and a water heater which employ the vacuum heat insulation material.SOLUTION: In a vacuum heat insulation material, a core material being a fiber assembly composed of glass containing 1.0 wt.% or more and 5.0 wt.% or less boron oxide and 50 wt.% or more silicon oxide, and a gas adsorption agent are packaged by an external capsule material having a gas barrier property, and the inside of the external capsule material is vacuumed and sealed. |
