試料に水圧をかけた時、どの程度で水が染み出すか評価する試験のこと。水圧への耐性を「耐水性」または「防水性」と呼ぶ。
試料に水圧をかけた時、どの程度で水が染み出すか評価する試験のこと。水圧への耐性を「耐水性」または「防水性」と呼ぶ。
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