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The benefits of using naphthenic base oils for this application are the high solvent power and the very good low temperature properties that are leading to good floc points for the refrigerant-oil mixture.
Nyfrost 68 is a hydrotreated naphthenic base oil, classified as an API Group V base oil. The viscosity at 40°C is 68 cSt for this product.
Sotugraisse, located outside Tunis, Tunisia, specializes in the production of grease and lubricants. The company produces a range of different greases and used to only use paraffinic oil in their grease production, but recently made the switch to using Nynas naphthenic oil in some of their products. Read more about A wind of change