| 摘要 |
The refrigerating machine oil of the present invention contains a mineral oil whose nitrogen content is not more than 50 ppm by mass and whose percent in aromatic ring structures (% C<SUB>A</SUB>) is from 5 to 25. With the refrigerating machine oil of the present invention, high levels of lubricity, stability, and miscibility with refrigerants are attained, with a good balance between these, so refrigerating and air conditioning machines can be operated stably over a longer period.
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