ProComp™ (Carbon Reinforced Polypropylene) Sheet Shop for ProComp™ (carbon reinforced polypropylene). In stock, ready to ship. ProComp™ is an innovative polypropylene material reinforced with carbon fibers for a 25% increase in stiffness. Layers of carbon fibers are infused between layers of homopolymer polypropylene which results in zero carbon fiber strand protrusion when finishing. Custom cuts and cut-to-size pieces. Have machined into fabricated parts. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote. We cut everything! Select your item, give us your cut requirements, we'll do the rest. Compare products selected. Clear List Prev Page - Next Compare products selected. Clear List Prev Page - Next ProComp™ composite thermoplastic resin-fiber materials are sold under license from, and are a product of, Rhode 401, LLC.