Dow Corning High Vacuum Grease Lubricant 2oz (57g) Recommended for vacuums reaching between 1x10-5 and 1x10-6 torr. Seals and lubricates chemical processing equipment. Lubricates laboratory equipment. Sealing vacuum pumps, o-rings and valves in HVAC and AC&R Systems. ealing vacuum and pressure systems. Lubricate synthetic rubber gaskets and seals in high-temperature applications. 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.