Yuav ua li cas thiaj li muaj txheej txheem tsim khoom ntawm Polyvinyl Alcohol - PVA cov khoom uas muaj zoo.

Peb cov txheej txheem tswj hwm khoom muaj peev xwm kom peb muaj peev xwm teb rau peb cov neeg siv khoom thov hauv lub sijhawm. Peb muaj ntau yam PVA khoom uas txo qis lub sijhawm ua tiav cov ntawv xaj thiab ua rau peb cov neeg siv khoom muaj kev txaus siab. Qhov no ua rau peb yog ib qho ntawm cov neeg muab khoom uas nyiam tshaj plaws hauv kev lag luam.

Peb cov neeg siv khoom xav tau yeej tau daws tau los ntawm cov kev daws teeb meem tshwj xeeb thiab kev paub uas ib lub tuam txhab muaj. Kev nkag siab txog lawv cov nhuav yuav ua rau peb tuaj yeem xa PVA khoom uas tsim nyog uas txhawb nqa peb cov neeg siv khoom lag luam. Qhov no tsom mus rau cov neeg siv khoom yog ib qho tseem ceeb rau peb txoj kev ua lag luam.