ASTM D 2413-16 (2022) "Preparative Method for Insulating Paper and Cardboard Impregnated with Liquid Media" is a standard issued by the American Society for Testing and Materials (ASTM) that specifies the preparatory procedure for insulating paper and Cardboard used for liquid dielectric impregnation. The standard applies to paper with a nominal thickness of 0.05 mm (2 mil) and above, and has been successfully used with insulating plates with a thickness of 6 mm (1/4 inch). During the preparatory process, it is necessary to ensure that the geometry of the sample is suitable for effective measurement of dielectric performance, depending on the electrode system used.