The joints and O-rings in a vacuum system are subjected to very adverse conditions – high or low temperatures, chemical attack, rubbing and scraping etc. Supervac Vacuum silicone grease – SV-G9 preserves, protects and enhances the functioning of the joints and O-rings.SV-G9 Vacuum grease reduces the leak rates associated with O rings and other vacuum connections. Hence, along with being used as a lubricant, it is also used as a sealant for joints in vacuum systems.