In this Book , Processing Techniques and experimental investigation of several properties has been discussed in detail by using class of sandwiched composite group having the combination of Fiber glass and polyurethane with different thickness. The successful fabrication of sandwiched composite of Fiber glass and polyurethane foam of different thickness has been done by simple hand lay-up technique. study revels that mechanical properties of composites as the sandwiched composite performs comparatively better than other type of composites and as compared with respect to different thickness of composites, the composites of higher thickness shows greater mechanical properties compared to the thin ones.