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Dow Corning* Silicone High Vacuum Stopcock Grease
Used as a sealant for vacuum and pressure systems. Lubricates valves and stopcocks, also for lubricating synthetic rubber gaskets in high-temperature applications. This stiff, non-melting, silicone, lubricating grease maintains its consistency from -40° to 204°C (-40° to 400°F). Not recommended for use where it will come in contact with liquid oxygen.