A homogeneous material created by the synthetic assembly of two or more materials (a selected filler or reinforcing elements and compatible matrix binder) to obtain specific characteristics and properties. Composites are subdivided into classes on the basis of the form of the structural constituents; Laminar - Composed of layer or laminar constituents; Particular - The dispersed phase consists of small particles; Fibrous -The dispersed phase consists of fibres; Flake - The dispersed phase consists of flat flakes; Skeletal - Composed of a continuous skeletal matrix filled by a second material.