Muva nje, ikhasimende libuze intengo yentambo ye-polypropylene, ikhasimende lingumkhiqizi wenetha lokudoba elithunyelwa kwamanye amazwe, ngokuvamile elisetshenziswa intambo ye-polyethylene, kodwa intambo ye-polyethylene intekenteke kakhulu, kulula ukuyixegisa ngemva kokubamba ifindo, futhi inzuzo yentambo yocingo oluyisicaba ukuthi i-monofilament yentambo ilukhuni, ukufiphaza akulula ukushelela.Kodwa i-polypropylene inzima kune-polyethylene.Ngokwethiyori, i-molecular formula ye-propylene yi-CH3CH2CH3, kanti i-molecular formula ye-ethylene yi-CH3CH3.I-Polypropylene ine-athomu yekhabhoni eyodwa kune-polyethylene, ngakho-ke isisindo sentambo ye-polypropylene bunzima kune-polyethylene.

Isakhiwo se-polyethylene simi kanje:

—(CH2-CH2-CH2-CH2)n—-

Isakhiwo se-polypropylene simi kanje:

—(CH2-CH(CH3)-CH2-CH(CH3)-CH2-CH(CH3))n—-

Kungabonakala esakhiweni ukuthi i-polypropylene inochungechunge lwegatsha ngaphezu kwe-polyethylene.Ngemva kokwenza intambo, ngenxa yendima yeketanga legatsha, intambo ye-polypropylene ine-tension enamandla kune-polyethylene, futhi akulula ukushelela.Ukuminyana kwe-polypropylene ngu-0.91 futhi ukuminyana kwe-polyethylene ngu-0.93, ngakho i-polyethylene kufanele ibe nzima.

Intambo ye-polyethylene iguquguquka kakhulu, ibushelelezi futhi ithambile kune-polypropylene.