Design as the described protective gas boxes, but with an additional evacuation lid. In order to reduce the residual oxygen in the box, protective gas boxes with evacuation lids can be used. These boxes have a lid for top loading, a protective gas inlet and outlet, and an evacuation cover with rubber gasket. The gas piping and the handling in the warm state corresponds to the gassing boxes on page 32. In addition, a connection for a vacuum pump via three-way ball valve is provided. In combination with a vacuum pump, the oxygen is evacuated from the box in cold state and afterwards flushed with protective gas. Repeating the process once or several times will significantly improve the results. After this process, the evacuation cover is removed and the actual heat treatment process is started under protective gas. After the heat treatment, the box is pulled out of the furnace and can be cooled in air or opened for batch removal.

• Protective gas box with fiber sealing and lid with locks, recess for evacuation lid, gas inlet via a pipe into the bottom of the box
• Evacuation lid with rubber sealing (Elastomer) and manometer
• Protective gas connection via threeway ball valve and quick coupling with hose connector (inner diameter 9 mm)

Additional equipment

• Digital temperature display
• Vacuum pump
• Gas supply systems
• Extended gas piping for the use of smaller boxes in larger furnace models
• Draw hook, starting from LH 30/.. a charging cart is recommended
• Charging stacker