Duckbill li qub yog ib qho, ib qho, elastomeric cov khoom siv uas ua raws li rov qab tiv thaiv cov twj siv hluav taws xob rov qab lossis ib-seem txoj kev kos lossis kos li qub. Lawv muaj daim di ncauj elastomeric nyob rau hauv cov duab ntawm cov plaub hau uas txwv tsis pub thim rov qab thiab tso cai rau kev khiav mus tom ntej. Lub ntsiab kom zoo ntawm duckbill li qub rau lwm hom kev siv ib-txoj kev yog tias duckbill li qub yog qhov nws tus kheej muaj xws li qhov kev ua haujlwm tseem ceeb ntawm kev sib tw yog ib feem tseem ceeb ntawm ib-thooj elastomer tiv thaiv raws li txwv tsis pub rau qhov twg cov khoom sib khi tau koom nrog du lub rooj saum npoo los ua ib lub foob. Yog li no duckbill li qub tau yooj yim teeb tsa thiab sib sau ua ke rau ntau yam khoom siv yam tsis muaj kev tsis yooj yim lossis teeb meem cuam tshuam nrog saum npoo tiav zoo ntawm mating lub rooj zaum thiab / lossis cov txheej txheem sib dhos ua ke.
Lwm yam tsis muaj nqis tseem ceeb xws li:
1. Txoj hauj lwm ywj pheej,
2. Tsis tshua muaj siab qhib siab- khiav tawm dawb tam sim,
3. Cov-tsis ntus ntws txoj hauv kev,
4. Siab ndlwg piv nrog cov pob loj,
5. Zoo tsis muaj qhov nruab nrog sab hauv thiab qhov chaw tuag,
6. Cov lus hais raws txoj cai,
7. corrosion-resistant,
8. Hnav-resistant thiab
9. kawg tab sis tsis yog tsawg kawg kom raug nqi.