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➢ The electrical conductivity of melt-spun ternary conductive polymer composites (CPCs), comprising PMMA, aligned carbon fibers (CF)[1] and carbon black (CB) has been investigated. A broad range of composite compositions (up to 50 vol.% CF and 20 vol.% CB) was studied. The percolation thresholds of binary PMMA/CF and PMMA/CB composites were determined to 31.8 and 3.9 vol.%, respectively.➢ To reveal the synergistic effects of CPCs containing both CFs and CB, a conductivity contour plot diagram for PMMA/CF/CB ternary composites were presented for the first time.