"Refinery-grade"-propylen anvendes meget sjældent i den kemiske industri på grund af den høje procentdel af propan, som frigøres under processen, og som skal behandles; desuden findes der kun få producenter af "chemical-grade"-propylen og "refinery-grade"-propylen.
Refinery-grade propylene is very rarely used in chemical processes because of the high percentage of propane that has to be treated as an off-gas; for the rest, there are only a few producers of chemical- and refinery-grade propylene.