VACUUM HEAT INSULATION MATERIAL

PROBLEM TO BE SOLVED: To provide a vacuum heat insulation material excellent in a heat insulation property and capable of retaining strength.SOLUTION: A vacuum heat insulation material 1 comprises a core material 2 and a cover material 3 covering the core material 2, and is sealed by evacuating the inside of the cover material 3. The core material 2 is constituted by laminating a plurality of core material layers 23, in which an inorganic powder 21 and inorganic fibers 22 are mixed and compression-molded, and the percentage content of the inorganic fibers 22 of one face side 23a of the thickness direction is made smaller than the percentage content of the other face side 23b of the thickness direction.SELECTED DRAWING: Figure 1 【課題】断熱性能に優れ、強度も確保できる真空断熱材を提供する。【解決手段】真空断熱材１は、芯材２と、芯材２を覆う外被材３とを有し、外被材３の内部を減圧して密封した真空断熱材１であって、芯材２は、無機粉末２１と無機繊維２２とを混合して圧縮成形した複数の芯材層２３を積層して構成されており、各芯材層２３を、厚さ方向の一方面側２３ａの無機繊維２２の含有率を、厚さ方向他方面側２３ｂの含有率より小さく構成してある。【選択図】図１