UNE 21-320 Pt.7-1991 Liquids for electrical technology installations. Definition and determination of special anti-corrosion additives present in insulating mineral oils
The purpose of this standard is to describe the methods to be used to detect and determine specific antioxidant additives present in insulating oils. Detection methods are applied to verify whether or not a hydrocarbon-based insulating oil contains antioxidant additive as declared by the manufacturer. The determination methods are used for the quantification of antioxidant additives previously detected by the appropriate detection methods. NOTE- In certain cases the methods described can be used for the analysis of oils in service.