Latest industry research report on Global Thermoplastic Prepreg Market 2016:Industry Size, Shares, Insights, Demand and Analysis to 2022. Thermoplastic prepregs are composite reinforcements (fiberglass, carbon fiber, aramid, etc.) that are pre-impregnated with thermoplastic resin. Common resins for Thermoplastic prepregs include PP, PET, PE, PPS, and PEEK. Thermoplastic prepregs can be provided in unidirectional tape, or in fabrics that are woven or stitched.