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Apiezon L Grease 25 G Tube is a silicone-and halogen-free ultra high vacuum grease suitable for use in scientific and industrial applications. L Grease has the best vapor pressure properties of all the Apiezon products and is therefore suitable for use in ultra high vacuum applications. L Grease is regularly used by highly respected organizations such as The European Space Agency, NASA and NATO. Apiezon L Grease is designed for use at ambient temperatures (generally between 10 to 30 degrees Celsius). If you are looking for a grease capable of performing at higher temperatures, Apiezon AP101 or Apiezon H Grease may be more appropriate. Apiezon L Grease is an ultra high vacuum grease which exhibits an extremely low vapor pressure of 7 x 10-7 Torr at 20 degrees Celsius. It does not suffer from contamination problems associated with silicone based greases such as 'creep' or 'carry over'. L Grease provides excellent lubrication and is recommended for use at ambient temperatures. It has built-in radiation resistance and powerful 'gettering' action, meaning it absorbs potentially harmful grease and chemical impurities on metal and glass surfaces. It is easy to clean and remove as it is soluble in hydrocarbon and chlorinated solvents.