While a vacuum-only furnace removes oxygen and moisture, adding high-pressure (HP) capabilities allows operator to manipulate the thermodynamics of the melt and the vapor pressure of volatile metals.

The "High Pressure & Vacuum" designation means the furnace can cycle between two distinct operational modes within a single synthesis or extraction run: (1) Vacuum phase: Removes H2O and O2 from the salt crystals (e.g., NaCl, AlCl3). (2) High Pressure Phase: Prevents the newly formed molten metal from vaporizing. By increasing the inert gas (Ar) pressure to 2–10 bar, you effectively raise the boiling point of the metal, keeping it liquid and stable.