Table 3.

Comparison of maximum conductivity values achieved by using different kinds of biochar.

Biomass Source	Matrix	Filler Loading (wt.%)	Conductivity (S/m)	Pressure (bar)	Ref.
Hemp	Epoxy resin	10	6	750	[20]
Hemp	EVA	40	10−5	750	This work
Coffee	Epoxy resin	15	10−2	1500	[18]
Tea	PP	40	2 × 10−2	1500	[58]