Plastics have widespread applications in virtually all consumer products and are expanding into applications traditionally filled by metals, glasses and ceramics. Generally, plastics including thermoset plastics and epoxies have limited use in applications where high temperatures, high chemical resistance, high wear resistance, high toughness and high dimensional stability are required. A nanophase-plastic additive has been developed to change the properties of plastics. This additive is nonmetallic and non-graphitic, has extremely high chemical resistance, extremely high thermal conductivity but is an electrical insulator and can be used, for example, to produce wire insulation that allows for high heat dissipation. Thermoset plastics are generally poor conductors of heat. Since heat is poorly transmitted through the plastic it is absorbed by the plastic, causing its temperature to rise to that of the heat source. The developed additive gives plastics a thermal conductivity and heat capacity which is about the same as silicon carbide, high dimensional stability (low coefficient of thermal expansion), high fracture toughness and high wear resistance, thermal diffusivity greater than copper but less than SiC and diamond. The use of additive allows the plastic/nano powder to transmit heat better and absorb heat less than the plastic alone.