Refining of naphthenic feedstocks In our refining processes we use a large number of mechanical, thermal and physico-chemical techniques, which are continually being modernised and extended, to remain state-of-the-art. Many years’ experience and constant process optimisation enable us to undertake selective refining of a wide range of different raw materials. Based on set quality performance figures for our input material, we control our processes precisely, to meet the desired and specified quality requirements at the output stage. back