Square hauv qab lub hnab

Sab kawg ntawm lub hnab, polymer (los yog hluavtaws resin) yog cov khoom tseem ceeb ntawm cov khoom siv, txhawm rau txhim kho cov khoom ntawm plastics, tab sis kuj nyob hauv lub polymer ntxiv ntau yam khoom siv los pab kom tau raws li ntau cov kev cai ntawm cov yas, xws li fillers , cov khoom yas, cov roj nplaum, cov yeeb tshuaj, cov xim, thiab lwm yam., los ua cov yas zoo. Lub hnab zuag feem ntau siv cov hluavtaws rhiab ua cov khoom tseem ceeb, hauv qab yog lub xwmfab thiab lub npe, unfolds zoo li lub thawv, qhov ntev ntev siab yuav txawv ib qhov, raws li xav tau qhov khoom ntawm cov khoom loj thiab "qhov Kev Ncaj Ncees".