Provided is a steam passage sealing label that is easily peeled off from a container or the like by heating a microwave. A steam-pass sealing label having a heat-shrinkable substrate and an adhesive layer, wherein the adhesive layer comprises a microwave heating material, A steam passage sealing label. The microwave heating material is at least one selected from the group consisting of zinc oxide and acrylic polymers obtained by copolymerizing a cyano group-containing unsaturated compound. Figure 3A
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