| abstract |
A refrigerator oil composition for a hydrofluorocarbon (hydrogen-containing flon) refrigerant, characterized by comprising a polyoxyalkylene glycol derivative and/or a specified polyester compound and added thereto (a) a partial fatty acid ester of a polyhydric alcohol and (b) a phosphate compound and/or a phosphite compound. It is excellent in the compatibility with a hydrogen-containing flon refrigerant, such as flon (134a), and in the lubricity, and utilizable as a refrigerator oil useful for an improvement in the resistance to abrasion, particularly between an aluminum material and a steel material. |