The document provides specifications for RETORT FURNACES with INERT GAS that can reach temperatures of 650°C. The furnaces are robustly constructed from bent plate with multilayer insulation. They have air circulation via a turbine to improve temperature homogeneity. Electrical resistors provide heating that is regulated by a PID digital controller. The furnaces are delivered with a retort, inert gas equipment, and retort support. Models vary in internal volume, retort and internal dimensions, external dimensions, power needs, and weight.