The present invention relates to a load softening test apparatus, a heating furnace in which an internal vacuum chamber is heated to a set temperature, a crucible disposed in the vacuum chamber, a sample is put into an internal accommodation space, and a sample through one side of the accommodation space a pressure unit for pressurizing the gas, a gas supply unit for discharging gas to the outside after inputting the gas into the receiving space, and a differential pressure measuring unit for measuring the pressure difference between the pressure of the gas introduced into the receiving space and the gas discharged to the outside of the receiving space. include
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