Na nso nso a, a ahịa jụrụ price nke polypropylene eriri, ndị ahịa bụ a emeputa nke azu net mbupụ, na-ejikarị bụ polyethylene eriri, ma polyethylene eriri ọzọ siri, mfe atọpụ mgbe knotting, na uru nke ewepụghị waya eriri bụ na monofilament nke eriri na-esi ike, knotting adịghị mfe ileghara.Mana polypropylene dị arọ karịa polyethylene.N'ụzọ doro anya, usoro ihe omimi nke propylene bụ CH3CH2CH3, na usoro ihe omimi nke ethylene bụ CH3CH3.Polypropylene nwere otu carbon carbon atom karịa polyethylene, yabụ oke nke eriri polypropylene dị arọ karịa polyethylene.

Ọdịdị nke polyethylene bụ ndị a:

— (CH2-CH2-CH2-CH2)n—-

Ọdịdị nke polypropylene bụ ndị a:

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

Enwere ike ịhụ site na nhazi ahụ na polypropylene nwere eriri alaka karịa polyethylene.Mgbe emechara eriri, n'ihi ọrụ nke yinye alaka, eriri polypropylene nwere esemokwu siri ike karịa polyethylene, ọ dịghịkwa mfe ịkwanye.Njupụta nke polypropylene bụ 0.91 na njupụta nke polyethylene bụ 0.93, ya mere polyethylene kwesịrị ịdị arọ karị.

Ụdọ polyethylene na-agbanwe agbanwe, dị nro ma dị nro karịa polypropylene.