Kutshanje, umthengi wabuza ixabiso lentambo ye-polypropylene, umthengi ngumvelisi wentambo yokuloba ethunyelwa ngaphandle, edla ngokusetyenziswa yintambo ye-polyethylene, kodwa intambo ye-polyethylene ithambile, kulula ukuyikhulula emva kokuqhina, kwaye inzuzo yentambo yocingo olucaba kukuba i-monofilament yentambo irhabaxa, ukuqhina akukho lula ukutyibilika.Kodwa i-polypropylene inzima kune-polyethylene.Ithiyori, i-molecular formula yepropylene yi-CH3CH2CH3, kunye ne-molecular formula ye-ethylene yi-CH3CH3.I-Polypropylene ine-athomu yekhabhoni enye kune-polyethylene, ngoko ubunzima bentambo ye-polypropylene bunzima kune-polyethylene.

Ubume be-polyethylene buhamba ngolu hlobo lulandelayo:

—(CH2-CH2-CH2-CH2)n—-

Ubume bepolypropylene buhamba ngolu hlobo lulandelayo:

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

Inokubonwa kwisakhiwo ukuba i-polypropylene inekhonkco yesebe ngaphezu kwe-polyethylene.Emva kokwenza intambo, ngenxa yendima yentambo yesebe, intambo ye-polypropylene ine-tension enamandla kune-polyethylene, kwaye akulula ukuyikhupha.Ubuninzi bepolypropylene yi-0.91 kunye nobuninzi be-polyethylene yi-0.93, ngoko ke i-polyethylene kufuneka ibe nzima.

Intambo yePolyethylene ibhetyebhetye, igudile kwaye ithambe kunepolypropylene.