Abstract: A temperature management member under a reduced-pressure atmosphere, wherein the difference in the discoloration temperature of a temperature-sensitive discoloration layer between under an atmospheric pressure atmosphere and under a reduced-pressure atmosphere can be minimized. A temperature management member under a reduced-pressure atmosphere includes a temperature-sensitive discoloration layer which contains granular or powdery hot-melt matter that melts at a melting temperature corresponding to a heating temperature to be detected under a reduced-pressure atmosphere and which is discolored in response to the hot melting thereof, and a difference in the melting temperature of the hot-melt matter within the temperature-sensitive discoloration layer between under an atmospheric pressure atmosphere and under the reduced-pressure atmosphere is 5° C. at most.

Abstract: A heat-sensitive indicator that prevents a solid-state colored hot-meltable substance from being absorbed into an absorber and surely absorbs a colored melt includes an ampule bottle enclosing a colored heat-sensitive material that melts into a colored melt at a predetermined temperature, a composite membrane rolled cylindraceous body joining an absorbable membrane for the colored melt onto one surface side of an impermeable membrane for the colored melt so that the impermeable membrane is located inside thereof, and a tube inserting and sealing the ampule bottle into a space surrounded by the impermeable membrane through which the absorbable membrane color is visible from the outside. After part of the ampule bottle is broken below the melting point of the colored heat-sensitive material to discharge a portion of the heat-sensitive material into the space and the heat-sensitive material is melted, a colored portion of the absorbable membrane is formed.

Abstract: Provided is a heat-sensitive indicator that is able to prevent a solid-state colored hot-meltable substance from being absorbed into an absorber, and that surely absorbs a colored melt.

Abstract: A temperature management member under a reduced-pressure atmosphere, wherein the difference in the discoloration temperature of a temperature-sensitive discoloration layer between under an atmospheric pressure atmosphere and under a reduced-pressure atmosphere can be minimized. A temperature management member under a reduced-pressure atmosphere includes a temperature-sensitive discoloration layer which contains granular or powdery hot-melt matter that melts at a melting temperature corresponding to a heating temperature to be detected under a reduced-pressure atmosphere and which is discolored in response to the hot melting thereof, and a difference in the melting temperature of the hot-melt matter within the temperature-sensitive discoloration layer between under an atmospheric pressure atmosphere and under the reduced-pressure atmosphere is 5° C. at most.