O-ring compound yog cov kua nplaum nyob hauv qhov kub thiab txias. Thaum lub sij hawm molding thiab vulcanization theem, qhov sib xyaw ua kom nrawm nrawm ntawm pwm kab noj hniav. Qhov sib xyaw ua ke ntau dhau (kom tiv thaiv tsis txaus, qee qhov sib xyaw ua ke yog ib txwm muaj nyob rau hauv cov kab noj hniav) overflows thaum lub sij hawm vulcanization, sib sau ntau tshaj (tseem hu ua flash lossis burrs). Thaum cov ntaub ntawv dhau lawm, nws yuav tsum tau muab tshem tawm kom ua tiav qhov zoo nkauj thiab zoo nkauj; txheej txheem no feem ntau hu ua trimming. Cov kev xav tau rau trimming yog qhov tseeb qhov tseeb thiab zoo nkauj zoo nkauj.
Hauv kev tsim khoom tiag tiag, kev txiav yog feem ntau lub sijhawm - siv thiab ua haujlwm - hnyav. Rau cov khoom uas yuav tsum tau nruj me ntsis, txawm me ntsis carelessness thaum lub sij hawm trimming tuaj yeem ua rau cov khoom puas, yog li nws yuav tsum tau ua tib zoo saib xyuas. Feem ntau hais lus, qhov me me ntawm cov khoom qhov ntev thiab qhov nyuaj ntawm nws cov duab, qhov nyuaj ntawm cov txheej txheem trimming thiab cov khoom tsis zoo yuav muaj ntau dua.