REFRIGERATOR OIL AND REFRIGERATOR WORKING FLUID COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a refrigerator oil having excellent compatibility with trifluoroethylene (HFO-1123) coolant and a refrigerator working fluid composition comprising the refrigerator oil.SOLUTION: The present invention provides a refrigerator oil used together with a trifluoroethylene refrigerant, the refrigerator oil containing as a base oil at least one oxygen-containing oil having a carbon/oxygen mole ratio of 2.5 to 5.8.