The purpose of this standard is to determine the relative solvent power of those hydrocarbon solvents, used in aeronautics and, in general, in the manufacture and application of varnishes and paints, which distill between 40° and 300°, provided that the determination of the The distillation interval is made by applying the UNE 51 011 standard, in the case of UNE 48167 type solvents, or similar, and the UNE 48085 standard, in the case of pure compounds or solvents with very narrow distillation intervals.