Stiff, non-melting silicone lubricating material. Dow Corning 976V High-Vacuum Grease Applications: Seals and lubricates chemical processing equipment. Lubricating plug valves, control valves, flow meter bearings, ceramic plug cocks, fire extinguisher valves, water treating equipment, synthetic rubber gaskets and seals in high temperature applications. Sealing vacuum and pressure systems. Lubricating O-rings in binoculars and telescopes. Prevents fogging of delicate lenses.