Polypropylene disadvantages Other recycling or re-conditioning methods must be considered, at a significantly higher cost. This low melting point also means that polypropylene is highly flammable and limited in its ability to withstand higher temperatures and it is also susceptible to UV degradation and oxidation. #chitraplast #granule #M12Granules #polypropylene #granules #hdpepipe #plastic #hdpegranules