1. Nyob hauv tus txheej txheem ntawm kev tsav tsheb thiab kev tshem tawm, tus fender yuav tsum raug muab pov tseg, thiab yuav tsum tu kom huv. Yuav tsis muaj kev sib tsoo.
2. Cov khoom tsim muaj yuav tsum ruaj khov thiab ruaj khov kom paub meej tias cov khoom tsis tau hloov los yog plam thaum lub sij hawm thauj tag nrho.
3. Tshem cov khoom thauj nrog cov khoom nqa zoo kom zoo tom qab cov khoom thauj los ntawm lub tsev kawm ntawv kom tsis txhob muaj kev puas tsuaj thiab kev sib tsoo.
4. Cov khoom siv roj hmab yuav tsum tsis txhob siv cov hnub ci, dej nag thiab daus, tsis txhob kov cov acids, alkalis, roj thiab cov organic solvents, etc. 1 meters ntawm qhov chaw ua kom sov, qhov kub thiab txias cia yuav tsum ceev cia thaum 15 mus rau 40 C .
