Prepreg is one of the most common forms of composite materials in which the reinforcement material is pre impregnated with either a thermoplastic or thermoset resin system in a predefined ratio It enables a consistent resinmatrix ratio in the finished product thus delivering uniform mechanical and physical properties throughout the final part The resin system in prepregs is partially cured for ease of handling and to prevent complete polymerization it is stored in a cool place This is the b stage product and needs to be heated in an autoclave or oven during the fabrication to achieve full polymerization With the advent of the growing demand for composites the usage of prepregs is growing and is finding a place in a multitude of applications