Polyvinyl cawv, los yog PVA, yog ib tug hluavtaws polymer. Cov polymer no muaj qhov zoo heev emulsifying, nplaum thiab zaj duab xis-tsim cov khoom. Cov khoom no ua rau PVA cov khoom siv dav siv hauv textile sizing, ntawv txheej thiab ua cov ntawv khi rau ntau yam khoom siv. Ib qho ntxiv ntawm PVA yog tias nws yog bio-raws li thiab ib puag ncig tus phooj ywg, uas ua rau nws zoo tagnrho rau siv rau hauv cov ntawv thov ruaj khov. Yog li ntawd, nws tsis yog qhov xav tsis thoob tias nrog rau qib ntawm kev ua tau zoo thiab ntau yam nws Polarvin PVA khav theeb, nws tau dhau los ua ib qho tseem ceeb hauv ntau daim ntawv thov kev lag luam.