1, yuav tsum pom cov xim ntawm cov ntsia hlau, yog tias nws qhov chaw dawb, dub, qias neeg thiab lwm yam uas tsis tsim nyog plating phenomenon, yuav tsum tau mus nrog cov khw ua pov thawj, yog li ntawd nws muab ib qho zoo ntsia hlau;
2. Yog hais tias lub taub hau ntawm lub hau tsis muaj burrs los yog tawg, nws yog qhov zoo;
3, vim hais tias lub hau ntswj yuav cuam tshuam rau cov nyhuv ntxig, xav pom seb puas muaj qhov sib txawv hauv kev twb kev txuas, yuav tsum tau hloov tam sim ntawd.
Cov khoom siv zoo yog siv cov khoom hluav taws xob, cov khoom ua si, cov khoom ua si, cov khoom ua si (lwm yam: plastics), thiab lwm yam. Kev ntsuas hluav taws xob feem ntau yog 6g (qib thib 2, Tebchaws Asmesliskas "IFI" yog 2A hniav), cov ntsia hlau siv hauv kev tsim kho yog 8g (qib 3, "IFI" yog 1A hniav). Tus nqi ntawm screws yog ib qho tseem ceeb heev. Muaj cov piv txwv nyob rau hauv lub ntiaj teb ntawm bankruptcies tshwm sim los ntawm pluag screw zoo. Tseem muaj cov qauv ntawm cov davhlau rau hauv thiab cov tsheb ua los ntawm cov neeg pluag screws. Cov hlau tsis txhuam pob tsuas yog feem ntau xa cov hlau uas tiv taus cov cua phem, dej, kua qaub, alkali ntsev, lossis lwm yam tawm. Raws li qhov sib txawv ntawm cov kab mob sib txawv, cov hlau tsis muaj stainless thiab cov kua qaub uas ua rau tawv nqaij yog cov nyom. Txawm hais tias muaj qee cov hlau muaj qhov tsis-rusting, lawv yuav tsis tas resistant acids, thiab cov acid-resistant steels feem ntau tsis-xeb-resistant. Lub hom phiaj tseem ceeb ntawm cov kev cai screws yog ua kom cov khoom muaj meej thiab kev ua tiav. Hauv kev siv, feem ntau nws tshwm sim tsis muaj qhov sib ze ntawm cov hniav thiab cov kaus hniav, yog hais tias lub taub hau tawg ntho dhau los, los yog cov hniav tsis nruj kaw, cov xwm txheej tsis tau ntsib. Qhov tseeb ntawm qhov teeb meem zoo.