Polyvinyl cov (PVA) yog ib qho polymer tsim los uas muaj ntau yam zoo rau ib puag ncig. Vim PVA yog ib qho khoom uas tsis cuam tshuam ib puag ncig, nws yog ib qho khoom uas tuaj yeem rhuav tshem hauv cov xwm txheej ntuj thiab yog li ntawd txo tau qhov ntau ntawm cov khoom yas uas tau nco. Nws qhov chaw siv suav nrog cov khoom ntim, textiles, thiab adhesives ua ib qho hloov rau cov khoom qub. PVA muab txoj hauv kev rau cov lag luam kom txhim kho lawv qhov kev ruaj ntseg thaum ua raws li cov kev xav tau uas nce ntxiv ntawm lawv cov neeg siv khoom rau cov khoom uas zoo rau ib puag ncig. Cov neeg siv khoom tuaj yeem ntseeg tau txog qhov zoo PVA muab los ntawm peb thiab paub tias peb muab cov kev xav tau ntawm ib puag ncig thiab cov kev ua tau zoo los ntawm peb qhov kev pom zoo.