1. Nkag siab txog kev ua tau zoo ntawmcov khoomthiab paub qhov txawv seb nws puas muaj tshuaj lom lossis tsis muaj. Qhov no feem ntau nyob ntawm seb cov yas ua los ntawm cov khoom siv dab tsi, thiab seb puas muaj cov tshuaj yas, cov tshuaj ruaj khov, thiab lwm yam ntxiv rau hauv. Feem ntau, cov hnab yas noj mov, cov fwj mis nyuj, cov thoob, cov fwj dej, thiab lwm yam muag hauv khw feem ntau yog cov yas polyethylene, uas tau muab roj rau qhov kov, thiab qhov saum npoo zoo li ib txheej ntawm cov quav ciab, uas yooj yim hlawv, nrog nplaim daj thiab cov quav ciab ntws. Nrog rau ntxhiab paraffin, cov yas no tsis muaj tshuaj lom. Cov hnab yas lossis cov thawv ntim khoom lag luam feem ntau yog ua los ntawm polyvinyl chloride, nrog cov tshuaj ruaj khov ntsev uas muaj cov hlau lead ntxiv rau lawv. Thaum kov tes, cov yas no nplaum thiab tsis yooj yim hlawv. Nws tawm mus tam sim ntawd tom qab tawm hauv hluav taws. nplaim ntsuab, thiab qhov hnyav hnyav. Cov yas no muaj tshuaj lom.
2. Tsis txhob sivcov khoom yaskom ntim roj, kua txiv hmab thiab cawv txiv hmab raws li koj xav tau. Txawm tias cov thoob dawb thiab pob tshab muag hauv khw tsis muaj tshuaj lom, tab sis lawv tsis haum rau kev khaws cia roj thiab kua txiv hmab mus ntev, txwv tsis pub cov yas yuav o yooj yim, thiab cov roj yuav raug oxidized, tsim cov tshuaj lom neeg rau tib neeg lub cev; Koj kuj yuav tsum tau them sai sai rau cov cawv txiv hmab, lub sijhawm yuav tsum tsis txhob ntev dhau, ntev dhau yuav txo qhov tsw thiab qib ntawm cov cawv txiv hmab.
Nws yog ib qho tseem ceeb heev uas yuav tsum nco ntsoov tias tsis txhob siv cov thoob yas PVC uas muaj tshuaj lom los tuav roj, kua txiv qaub, cawv, thiab lwm yam. Yog tsis ua li ntawd, nws yuav ua rau cov roj, kua txiv qaub thiab cawv qias neeg. Nws tuaj yeem ua rau mob, xeev siab, ua xua rau daim tawv nqaij, thiab lwm yam, thiab txawm tias ua rau cov pob txha thiab lub siab puas tsuaj yog tias muaj mob hnyav. Tsis tas li ntawd xwb, peb kuj yuav tsum tau ceev faj kom tsis txhob siv cov thoob yas los ntim roj kerosene, roj av, diesel, toluene, ether, thiab lwm yam, vim tias cov khoom no yooj yim ua rau cov yas mos thiab o kom txog thaum nws tawg thiab puas tsuaj, ua rau muaj qhov tshwm sim tsis tau xav txog.
3. Ua tib zoo saib xyuas thiab tiv thaiv kev laus. Thaum tib neeg siv cov khoom yas, lawv feem ntau ntsib cov xwm txheej xws li tawv, brittleness, discoloration, tawg thiab kev ua haujlwm poob qis, uas yog kev laus ntawm cov yas. Txhawm rau daws qhov teeb meem kev laus, tib neeg feem ntau ntxiv qee cov antioxidants rau cov yas kom qeeb qeeb kev laus. Qhov tseeb, qhov no tsis daws qhov teeb meem tseem ceeb. Txhawm rau ua kom cov khoom yas ruaj khov, nws yog qhov tsim nyog siv lawv kom raug, tsis txhob raug tshav ntuj, tsis txhob los nag, tsis txhob ci rau ntawm hluav taws lossis cua sov, thiab tsis txhob sib cuag nrog dej lossis roj ntau zaus.
4. Tsis txhob hlawv pov tsegcov khoom yasRaws li tau hais ua ntej lawm, cov yas lom tsis yooj yim hlawv, vim tias lawv tso pa dub, tsw ntxhiab thiab cov pa lom thaum hlawv, uas ua rau ib puag ncig thiab tib neeg lub cev puas tsuaj; thiab kev hlawv tsis muaj tshuaj lom kuj yuav ua rau ib puag ncig puas tsuaj thiab cuam tshuam rau tib neeg kev noj qab haus huv. Nws kuj tseem tuaj yeem ua rau muaj ntau yam kev o.