Cov qe qe feem ntau yog hais txog cov khoom ntim khoom siv los tuav cov qe, cov qe qe thiab lwm yam khoom qe.Lub luag haujlwm tseem ceeb yog nqus cov kev poob siab, ua kom lub qe tso, thiab ua kom lub qe kev thauj mus los yooj yim dua, nyab xeeb thiab ceev.Yas qe tais tseem tuaj yeem muab faib ua cov qe yas thiab PVC pob tshab qe thawv nyob ntawm cov khoom siv raw.