Tailored sPP/Silica Nanocomposite for Ecofriendly Insulation of Extruded HVDC Cable

Table 3

Comparison between sPP/chl-silica nanocomposites and XLPE.

Properties	sPP/chl-silica nanocomposites	XLPE
Operating temperature	70°C	70°C [11, 12]
Breaking elongation	≥200%	≥200% [13]
Tensile yield strength (25°C)	≥10 MPa	22 MPa [14]
DC volume resistivity	≥10^17 Ω·cm (6 kV/mm)	0.92 × 10^17 Ω·cm (10 kV/mm) [15]
Space charge characteristics	No space charge accumulation in sPP with 0.5 phr and 1 phr chl-silica	Small amount of heterospace charge near anode and slight charge injection near cathode (−50 kV/mm) [15]