TPO is a material made by combining Polyethylene, Polypropylene and EPDM rubber.

It has been used in automotive applications for decades. This rubberized material is classified as TPO when the material contains at least 20 percent rubber. It has been estimated that 10 % or more of landfill space is taken up by roofing waste, thus making the recycling of roofing necessary, making TPO a very attractive solution.