An Investigation of the Electrical Properties of Pressboard Impregnated with Mineral Oil-Based Nanofluids at Different Concentrations of Fe₃O₄ Magnetic Nanoparticles

Table 1

Specification of mineral oil used for impregnated pressboard.

Characteristics	Specification	Test Method
Kinematic viscosity	16.5 mm2/sec (at 40°C)	ISO: 3104
Flash point, PMCC	140°C	ISO: 2719
Pour point	−30°C	ISO: 3016
Density	0.895 g/ml (at 20°C)	ISO: 3675
Interfacial tension	0.04 N/m (at 25°C)	ISO: 6275
Acidity	0.03 mg KOH/g	IEC: 296
Tan δ	0.005 (at 90°C)	IEC: 247