Umupira wa polypropilene ni ukurwanya ubushyuhe, kurwanya imiti yangiza ya plastiki, harimo polyethylene (PE), polypropilene (PP), polypropilene ikomeza (RPP), chloride polyvinyl (PVC), chlorine polyvinyl chloride (CPVC), na (PVDF) nka ibikoresho byo gupakira umunara.