FIELD: chemistry.
SUBSTANCE: composition contains oil which contains naphthene base oil on a mineral base, paraffin base oil on a mineral base and/or paraffin base oil obtained via Fischer-Tropsch synthesis, a copper passivator, and from 0.001 to less than 0.1 wt % sulphur-based organic compound as an antiwear additive. The composition can also contain a phenol or amine antioxidant. The composition of the base oil and antiwear additive undergoes purification with bleaching clay with subsequent addition of the copper passivator and an optional antioxidant. The composition is used as electrically insulating oil, particularly transformer oil.
EFFECT: high oxidative stability with low content of additive.
21 cl, 6 tbl, 2 dwg, 4 ex
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