black, graphite or with silver-coated basalt particles or fibres were investigated in this paper.
Percolation concentrations were determined to be 14 vol% for epoxy/carbon black
composites, 22 vol% for epoxy/graphite composites, 28–29 vol% for both epoxy/silver-
coated basalt particles and fibres. The steepest increase in electrical conductivity and the
most pronounced decrease in elongation at break occurs at similar filler concentration range …