| abstract |
A lubricant composition and working fluid useful in alleviating wear of aluminum surfaces in refrigeration equipment exposed to said composition and working fluid. The composition comprises an ester lubricant formed from at least one alcohol selected from the group consisting of monopentaerythritol, dipentaerythritol and tripentaerythritol and at least 80 % of at least one carboxylic acid selected from the group consisting of 2-methylbutanoic acid, 3-methylbutanoic acid, n-pentanoic acid, and isononanoic acid. The working fluid comprises the lubricant composition and a chlorine-free fluoro-group containing heat transfer fluid such as 1,1,1,2-tetrafluoroethane. |