| abstract |
A vacuum heat-insulating material (10) includes: an outer cover material (11); and a core material (12) which is sealed in a tightly closed and decompressed state on the inside of the outer cover material (11). Outer cover material 11 has gas barrier properties and satisfies at least one of (1) a condition that a linear expansion coefficient is 80 × 10 -5 /°C or lower when a static load is 0.05 N within a temperature range of -130°C to 80°C, inclusive, (2) a condition that an average value of a linear expansion coefficient is 65 × 10 -5 /°C or higher when a static load is 0.4 N within a temperature range of -140°C to -130°C, inclusive, (3) a condition that an average value of a linear expansion coefficient is 20 × 10 -5 /°C or higher when a static load is 0.4 N within a temperature range of -140°C to -110°C, inclusive, and (4) a condition that an average value of a linear expansion coefficient is 13 x 10- 5 /°C or higher when a static load is 0.4 N within a temperature range of +50°C to +65°C, inclusive,. |