Cov khoom siv raw ntawm cov thoob yas yog ib hom khoom siv hluavtaws polymer nrog ntau yam kev siv. Cov khoom yas muaj ntau hauv peb lub neej txhua hnub. Cov khoom ntawm cov thoob yas muaj plaub yam nram qab no:
1. Yas yog malleable. Raws li lub npe implies, yas yog ib yam khoom uas yuav molded. Lub npe hu ua plasticity ntawm cov yas txhais tau hais tias cov khoom yas tuaj yeem muag tau los ntawm cov cua sov, thiab tom qab ntawd cov yas muag muag tau muab tso rau hauv pwm thiab tso cai rau txias thiab rov ua kom zoo rau hauv cov khoom zoo.
Cov cuab yeej ntawm cov yas no kuj muaj qhov tsis zoo, uas yog, nws yooj yim rau soften thiab deform thaum raug tshav kub. Qee cov yas tuaj yeem deformed tom qab scalded nrog dej kub. Yog li ntawd, cov khoom yas feem ntau tsis haum rau kev sib cuag nrog cov dej kub npau npau.
2. Cov yas yog elastic. Qee cov yas kuj tseem elastic zoo li hluavtaws fibers. Thaum nws yog stretched los ntawm ib tug sab nraud quab yuam, cov curled molecules yog straightened los ntawm yooj, tab sis thaum lub nro raug tshem tawm, nws yuav rov qab mus rau lub qub curled lub xeev, uas ua rau cov yas elastic, xws li cov polyethylene thiab polyvinyl chloride. Cov khoom ua yeeb yaj kiab. Tab sis qee cov plastics tsis elastic.
3. Cov yas muaj corrosion kuj. Cov yas tsis muaj xeb nyob rau hauv cov huab cua zoo li hlau, los yog rot los yog eroded los ntawm cov kab mob nyob rau hauv ib puag ncig ntub xws li ntoo. Tsis tas li ntawd, plastics yog resistant rau acid thiab alkali corrosion. Yog li ntawd, cov yas feem ntau yog siv los ua cov kav dej thiab cov kua dej hauv cov nroj tsuag tshuaj, qhov rooj thiab qhov rais hauv tsev, thiab lwm yam.
4. Cov yas muaj cov khoom siv insulating. Cov saw hlau molecular ntawm cov yas yog covalently bonded los ntawm atoms. Molecules tsis tuaj yeem ionize lossis hloov cov electrons hauv cov qauv, yog li cov yas muaj cov khoom siv insulating. Cov yas tuaj yeem siv los tsim cov ntaub qhwv, cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob.
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