Kev ntim tshuaj yog ib qho tseem ceeb ntawm kev lag luam tshuaj thiab ua lub luag haujlwm tseem ceeb hauv kev ua kom muaj kev nyab xeeb, kev ua haujlwm zoo thiab zoo ntawm cov tshuaj. Lub hom phiaj ntawm cov yeeb yaj kiab tshuaj yog los tiv thaiv cov tshuaj los ntawm cov yam ntxwv ib puag ncig, kev ua qias tuaj, thiab kev puas tsuaj rau lub cev, thiab los muab cov ntaub ntawv tsim nyog rau kev siv nyab xeeb. PVC (polyvinyl chloride) yog cov khoom siv feem ntau siv hauv kev ntim tshuaj. Yog vim li cas HSQY Plastic muaj ntau yam yeeb yaj kiab ntim, suav nrog cov yeeb yaj kiab PVC tawv, PVC / PVDC zaj duab xis, PVC / PE, ntawv ci txhuas, thiab PVC / PVDC / PE zaj duab xis rau ntim tshuaj.