Pultrusion is a continuous process for manufacturing composites that have a constant cross-sectional shape. The process consists of pulling a fiber reinforcing material through a resin impregnation bath and through a shaping die, where the resin is subsequently cured. The primary reinforcement in pultrusion is in the longitudinal fiber direction whereas in filament winding it is in the hoop direction. These materials are generally used in structural applications.Commonly used reinforcements in pultrusion are glass, carbon and aramid fibers. The matrix material must cure quickly not only because of the high speed of material production but also it is a continuos process.