Crude oils are complex mixtures, containing thousands of different molecules.
Because these complex mixtures are difficult to identify chemically, they are grouped according to the predominant type of hydrocarbon: paraffinic, naphthenic, or aromatic.
Nynas refines from naphthenic-rich crude oils because of their high solvency. Naphthenic oils are also virtually free from waxes. This means they continue to flow at very low temperatures, which is essential in many applications.