Cov khoom siv yas muaj xws li cov khob yas, cov hnab yas noj su, cov tais diav yas, thiab lwm yam.
Cov khoom siv yas yog cov ntsiab lus dav dav rau cov khoom siv hauv tsev thiab cov khoom lag luam uas ua los ntawm cov yas los ntawm ntau yam txheej txheem. Lawv feem ntau suav nrog cov khoom tsim siv yas ua cov khoom siv raw, xws li kev txhaj tshuaj molding thiab lub tshuab nqus tsev.
Plastics yog ib chav kawm ntawm cov khoom siv hluavtaws polymer nrog plasticity. Lawv, nrog rau cov roj hmab hluavtaws thiab hluavtaws fibers, tsim peb yam khoom siv hluavtaws tseem ceeb rau lub neej txhua hnub.
Cov thermoplastics feem ntau muaj xws li cellulose nitrate plastics, cellulose acetate plastics, polyethylene plastics, polypropylene plastics, polystyrene plastics, thiab polyvinyl chloride plastics.
Piv txwv li, cov khoom siv muaj xws li cov dej ntxhia dej thiab cov hnab yas. Lub hom phiaj tseem ceeb ntawm - cov yas hom phiaj muaj xws li polyethylene, polyvinyl chloride, polypropylene, polystyrene, phenolic thiab amino plastics, thiab lwm yam.