Cov thawv ntim khoom noj uas siv tau pov tseg yog cov khoom siv rooj ua los ntawm foamed polystyrene (PS).
Cov khoom no yog tus cwj pwm los ntawm nws lub teeb yuag, thermal rwb thaiv tsev zog, roj tsis kam, dej tsis kam (zoo dej repellency), corrosion kuj, zoo tshuaj stability, yooj yim ntawm kev ua, thiab tus nqi qis.
Txawm li cas los xij, cov khoom no tsis tiv taus qhov kub thiab txias. Lub softening point ntawm polystyrene yog kwv yees li 110℃mus rau 120 degree, thaum nws depolymerization kub tshaj 280 degree. Txawm li cas los xij, hauv kev siv tswv yim, thaum qhov kub ntawm cov khoom noj muaj nyob rau hauv siab tshaj 65℃mus rau 90 degree, cov khoom tsis zoo uas muaj nyob hauv lub thawv tuaj yeem txav mus rau hauv cov zaub mov. Yog li ntawd, cov thawv no tsis pom zoo kom tuav cov zaub mov kub heev thiab yuav tsum tsis txhob muab tso rau hauv lub qhov cub microwave rau cua sov.
Qee cov khoom lag luam tsis raug cai yuav, thaum lub sijhawm tsim khoom, yuav ua txhaum cai nrog cov khoom siv xws li cov khoom siv calcium carbonate, cov khoom siv rov ua dua tshiab, cov khoom siv paraffin, lossis cov tshuaj fluorescent whitening agents. Thaum cov khoom no nkag mus rau hauv cov zaub mov- tshwj xeeb yog cov khoom noj kub lossis rog- lawv tuaj yeem tawm mus, yog li ua rau muaj kev pheej hmoo rau tib neeg kev noj qab haus huv.
