1. Lub ntiajteb txawj nqus tshwj xeeb. Rau cov hlua hlau ntawm tib txoj kab uas hla, qhov siab dua qhov tshwj xeeb lub ntiajteb txawj nqus, qhov zoo dua.
2. Hlau hlua Core. Cov tub ntxhais muaj zog dua thiab siab dua qhov tshwj xeeb lub ntiajteb txawj nqus, qhov zoo dua qhov kev txhawb nqa rau cov hlua sab nrauv, thiab qhov zoo dua.
3. Khoom siv. Cov ntaub ntawv hais txog qib steel thiab lub zog. Qhov siab dua cov qib steel thiab lub zog siab dua, qhov zoo dua.
4. Ib txoj hlua xoob me ntsis tom qab txiav yog suav tias yog qhov zoo. Cov hlua hlau uas muaj qhov ntev ntev yog qhov zoo dua li cov uas muaj qhov ntev ntev.
5. 316 stainless hlau xaim hlua muaj kev tiv thaiv corrosion zoo dua li 306 stainless hlau xaim hlua, 306 muaj kev tiv thaiv corrosion zoo dua li kub -dip galvanized hlau hlua, thiab kub- dip galvanized hlau hlua tau zoo dua li cov hlua hlau electrogalvanized. Nylon yas-coated hlau hlua muaj zoo dua PE yas-coated hlau hlua, PE yas-coated hlau hlua muaj zoo zoo dua li PVC yas-coated hlau hlua, thiab yas-coated hlau hlua muaj corrosion kuj zoo dua galvanized hlau hlua.
