• Vacuum Casting : A casting in which metal is melted and poured under very low atmospheric pressure; a form of permanent mold casting where the mold is inserted into liquid metal, vacuum is applied, and metal drawn up into the cavity.
  • Vacuum Degassing : The use of a vacuum technique to remove dissolved gases from molten alloys.
  • Vacuum Refining : Melting in a vacuum, usually by electrical induction, to remove gaseous contaminants from the metal.
  • Virgin Metal (Primary Metal) : Metal extracted directly from the ore; not previously used.