Box-type muffle furnace is a commonly used high-temperature furnace, which is widely used in metal heating, sintering, annealing and other processes. In order to ensure the accuracy and stability of the temperature in the furnace, it is very important to verify the box-type muffle furnace. This article will give a detailed introduction to the inspection records of box-type muffle furnaces.Process optimization of alumina ceramic sintering technology Furnace door sealing performance verification The sealing performance of the furnace door is one of the important factors for the box-type muffle furnace to maintain temperature stability. The characteristics and working principle of vacuum heat treatment furnacesThe verification record should include the following: 1. Check whether the furnace door seal is intact and whether there are problems such as aging and cracking;Alumina ceramic densely sintered ⒉. Make sure there is no obvious air leakage after the furnace door is closed; 3. Evaluate whether the sealing performance meets the requirements by observing whether there is obvious heat leakage around the furnace door.Atmospheric Pressure and Vacuum Sintering of High Purity Dense MgO Ceramics