Fibers are added to polymers to provide reinforcement: reinforcement obtained is both dependent upon the strength and length of the fiber and upon the effectiveness of the fiber / matrix bond. In general, addition of fibers improves the mechanical properties of plastics like tensile strength, elasticity and heat stability. Carbon and metallic fibers are known to offer antistatic and conductive properties to the plastic. Fibrous additives can be glassy, metallic, carbonaceous or ceramic in nature.