摘要 |
A high quality heavy duty lubricant for refrigerating compressors, especially those using chlorine free hydrofluorocarbon refrigerant working fluids, is provided by mixed esters of hindered polyols, most desirably pentaerythritol with a mixture of carboxylic acids including at least some iso-pentanoic acid along with at least 13 % of dibasic acids such as adipic.
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