| 摘要 |
The present invention provides a heat insulator that is extremely low in environmental load during production and recycling, is superior in handleability and workability, and shows favorable heat-insulating properties over an extended period of time. The present invention relates to vacuum heat insulator, comprising at least a core member and an external packaging member that stores the core member and can keep inside under reduced pressure, wherein the core member is a sheet-shaped fiber aggregate containing a polyester fiber having fiber size of 1 to 6 deniers in an amount of 50 wt % or more.
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