Polymer and plastic composites are strengthened with fibers, fillers, particulates, powders and other matrix reinforcements to provide improved strength and/or stiffness. Examples of polymer and plastic composites include fiber reinforced plastics (FRPs), sheet molding compounds (SMCs), bulk molding compounds (BMCs), pre-preg materials, and fabricated composite parts. Fibers are usually chopped, wound or woven and made of materials such as fabric, metal, glass, or fiberglass. Solid, self-lubricated, and bearing grade fillers are commonly available. Particulates vary in terms of shape and size. Powders are usually made of carbon, graphite, silicates, ceramics, and other organic or inorganic materials. Some matrix reinforcements provide improved electrical conductivity. Others offer improved thermal conductivity.