Cov hauv qab no tuaj yeem siv los kuaj seb lub hnab yas puas muaj tshuaj lom lossis tsis yog - lom.
Kev kuaj pom: Tsis yog- cov hnab yas muaj tshuaj lom yog mis nyuj dawb, pob tshab, lossis tsis muaj xim thiab pob tshab, hloov tau yooj yim, du rau qhov kov, thiab muaj waxy nto; Cov hnab yas muaj kuab lom yog huab lossis daj daj, thiab hnov ntxhiab thiab ntxhib rau qhov kov.
Kev ntsuas dej: Muab lub hnab yas tso rau hauv dej thiab nias rau hauv qab. Cov hnab yas uas tsis yog- tshuaj lom, tsis tshua muaj ntom, yuav ntab; cov hnab yas muaj tshuaj lom, ua denser, yuav tog.
Kev kuaj hluav taws: Tsis yog- cov hnab yas polyethylene muaj tshuaj lom yog nplaim taws, nrog lub nplaim xiav uas tig daj rau saum, drips zoo li tswm ciab ciab thaum hlawv, muaj paraffin - zoo li tsw ntxhiab, thiab ua pa me me; Cov hnab yas polyvinyl chloride tsis tuaj yeem yooj yim tawg, tua tam sim ntawd thaum tshem tawm cov nplaim taws, muaj cov nplaim daj uas tig ntsuab rau hauv qab, muag muag thiab tuaj yeem rub mus rau hauv cov xov, thiab muaj cov ntxhiab tsw zoo ib yam li hydrochloric acid.
Kev kuaj ntxhiab tsw: Cov hnab yas ua los ntawm cov khoom siv rov ua dua tshiab muaj cov ntxhiab tsw tsw qab.
Kev sim co: Tuav ib qho kawg ntawm lub hnab yas thiab co nws lub zog. Lub suab nkig qhia tias nws tsis yog - lom; ib lub suab npub qhia tias nws yog tshuaj lom.