| 摘要 |
An electrical insulating oil having excellent oxidation stability, thermal stability, corona resistance and corrosion resistance and, if desired, low-temperature properties, which consist essentially of a blend of a refined oil (I) derived from a paraffin or mixed base crude oil, a refined oil (II) prepared from a lubricating oil fraction of a mineral oil and, if desired, an amorphous ethylene-propylene copolymer (III). The oils (I) and (II) may be blended together in ratios by weight of 80- 99:1- 20. In one embodiment, the copolymer may be added to the blend of the oils (I) and (II) in ratios by weight of 0.001- 1.0 to 100 thereby to obtain an electrical insulating oil having excellent low-temperature properties in addition to the above-mentioned excellent properties.
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