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aceites residuales (petróleo), refinados con disolvente; aceite de base, sin especificar
residual oils (petroleum), solvent-refined; base oil — unspecified (a complex combination of hydrocarbons obtained as the solvent insoluble fraction from solvent refining of a residuum using a polar organic solvent such as phenol or furfural.
l aceites residuales (petróleo), desparafinados con disolvente; aceite de base, sin especificar
(a complex combination of hydrocarbons obtained by removal of long, branchedchain hydrocarbons from a residual oil by solvent crystallisation.