Dow Corning® Vacuum Grease.  Also called MOLYKOTE High Vacuum Grease. A NLGI Grade 3-4, translucent white grease, used primarily in sealing vacuum and pressure systems.

Formally called Dow Corning High Vacuum Grease or Dow Corning High Vacuum Grease 976V, the name has changed, but not the formulation. The merger and then splitting of the DowDupont companies now have this grease under the DuPont MOLYKOTE line of greases.

The standard sealant for hanging, sitting, and sandwich drop vapor diffusion setups. Stiff, non-melting, non-drying silicone sealant maintains its consistency from -40° to 260°C. Chemical-resistant and non-carbonaceous. Squeeze the grease into a 10 cc syringe fitted with a 200 µl pipet tip trimmed to desired diameter and you are ready to grease.