Made with 80% recycled content, CorrectDeckCX is PVC-free and made from 60% hardwood fiber and 40% UV-stabilized polypropylene. The manufacturer claims the deck boards are resistant to rotting, staining, and fading, largely because of the recent addition of a top layer of virgin polypropylene—about 1% of the board—to shield it from moisture and protect it from weather and wear. The use of polypropylene instead of polyethylene makes the boards lighter than some competing products, the manufacturer claims, so they can span longer distances and withstand higher temperatures with less expansion and contraction. 877.332.5877.