Thermoplastic polyolefin (TPO)
refers to a mixed material composed of polyolefin (PP or PE), rubber and certain fillers (talc, carbon fiber, etc.). These are members of the TPE (Thermoplastic Elastomer) family.
TPO is basically a blend of Polypropylene and EPDM rubber. Together, these two materials result in some interesting properties that make TPO an attractive substitute to more traditional weatherable thermoformable materialsuch as acrylic capped ABS.