A composition comprising: a. from 35 to 80 vol% of a thermoplastic polymer, wherein the thermoplastic polymer comprises a polyamide, polyester, polyethylene and ethylene based copolymer, polypropylene, polyphenylene sulfide, polyetheretherketone, polycarbonate, polyetherimide, or a combination thereof; b. from 5 to 45 vol% of a thermally insulative filler with an intrinsic thermal conductivity less than or equal to 10 W/mK, wherein the thermally insulative filler comprises H 2 Mg 3 (SiO 3) 4 (talc), CaCO 3 (calcium carbonate), Mg 2 (magnesium hydroxide), mica, BaO (barium oxide), γ-AlO (boehmite), γ-AlO (diaspore), Al 3 (gibbsite), BaSO 4 (barium sulfate), CaSiO 3 (wollastonite), ZrO 2 (zirconium oxide), SiO 2 (silicon oxide), a glass bead, a glass fiber, MgO·xAl 2 O 3 (magnesium aluminate), CaMg(CO 3) 2 (dolomite), a clay, or a combination thereof; and c. from 5 to 15 vol% of a thermally conductive filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK, wherein the thermally conductive filler comprises AlN (aluminum nitride), BN (boron nitride), MgSiN 2 (magnesium silicon nitride), SiC (silicon carbide), graphite, ceramic-coated graphite, expanded graphite, graphene, a carbon fiber, a carbon nanotube, graphitized carbon black, or a combination thereof; wherein the composition is characterized by: i. a thermal conductivity of at least 1.0 W/mK; ii. a thermal conductivity of at least 7 times the total filler volume fraction times the thermal conductivity of the pure thermoplastic polymer; and iii. a volume resistivity of at least 10 7 Ohm.cm. a. from 35 to 80 vol% of a thermoplastic polymer, wherein the thermoplastic polymer comprises a polyamide, polyester, polyethylene and ethylene based copolymer, polypropylene, polyphenylene sulfide, polyetheretherketone, polycarbonate, polyetherimide, or a combination thereof; b. from 5 to 45 vol% of a thermally insulative filler with an intrinsic thermal conductivity less than or equal to 10 W/mK, wherein the thermally insulative filler comprises H 2 Mg 3 (SiO 3) 4 (talc), CaCO 3 (calcium carbonate), Mg 2 (magnesium hydroxide), mica, BaO (barium oxide), γ-AlO (boehmite), γ-AlO (diaspore), Al 3 (gibbsite), BaSO 4 (barium sulfate), CaSiO 3 (wollastonite), ZrO 2 (zirconium oxide), SiO 2 (silicon oxide), a glass bead, a glass fiber, MgO·xAl 2 O 3 (magnesium aluminate), CaMg(CO 3) 2 (dolomite), a clay, or a combination thereof; and c. from 5 to 15 vol% of a thermally conductive filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK, wherein the thermally conductive filler comprises AlN (aluminum nitride), BN (boron nitride), MgSiN 2 (magnesium silicon nitride), SiC (silicon carbide), graphite, ceramic-coated graphite, expanded graphite, graphene, a carbon fiber, a carbon nanotube, graphitized carbon black, or a combination thereof; wherein the composition is characterized by: i. a thermal conductivity of at least 1.0 W/mK; ii. a thermal conductivity of at least 7 times the total filler volume fraction times the thermal conductivity of the pure thermoplastic polymer; and iii. a volume resistivity of at least 10 7 Ohm.cm. i. a thermal conductivity of at least 1.0 W/mK; ii. a thermal conductivity of at least 7 times the total filler volume fraction times the thermal conductivity of the pure thermoplastic polymer; and iii. a volume resistivity of at least 10 7 Ohm.cm.