A significant penetration of the composite industry has been witnessed over the past few years with the so-called thermoplastic-based composite compounds. Once a polymeric material has been chosen, one of the first questions product engineers and designers need to answer is whether to use a thermoplastic or a thermoset resin. The resulting manufacturing process will then be immediately differentiated. Whereas thermoplastic are melted under heat and thus can be formed to the desired shape (for the main processing techniques this is handled with a steel mold — injection; a die — extrusion; or an aluminum or composite tool — thermoforming), thermosets need an in-mold curing step.