Distillates (petroleum), solvent-refined heavy naphthenic (10C)
Distillates, petroleum, solvent-refined heavy naphthenic
A complex combination of hydrocarbons obtained as the raffinate from a solvent extraction process.  It consists of hydrocarbons having carbon numbers predominantly in the range of C20 through C50 and produces a finished oil with a viscosity of at least 100 SUS at 100.degree.F (19cSt at 40.degree.C).  It contains relatively few normal paraffins.