Apparatus for evaluating lubrican

Abstract

An apparatus having a vacuum vessel that has a mechanism using a lubricant therein and not causing defects and faults to samples introduced into the vacuum vessel even it is an apparatus where lubricating oil or grease is applied is provided. An apparatus having a vacuum vessel that has a mechanism using a lubricant therein such as CD-SEM, in which a lubricant (oil, grease) whose adsorption amount per minute to a surface of a material introduced into the vacuum vessel of an apparatus for evaluating a lubricant after the start of vacuum evacuation and after reaches a quasi-equilibrium state is below 0.09 ng/cm2 is employed.

Dependencies are inferred from the claim text.