(1) Cov khoom siv rau cov kav hlau:
Cov khoom siv rau cov kav hlau muaj xws li seamless steel kav, kub-dip galvanized steel kav, tooj liab kav, cam khwb cia hlau kav, los yog fiberglass-reinforced yas (FRP) kav. Rau aluminium alloy lined composite kav, aluminium alloy cov ntaub ntawv xws li 6063 yog siv. Cov kav hlau no yuav tsum ua tau raws li cov qauv hauv lub tebchaws, piv txwv li, cov kav dej kub-dip galvanized steel yuav tsum ua raws li GB / T 3091.
(2) Cov khoom siv rau cov kav dej yas:
Cov khoom siv rau cov kav dej yas feem ntau yog cov khoom siv yas muaj zog xws li high-density polyethylene (HDPE), polypropylene (PP-R), thiab polyethylene ntawm qhov kub thiab txias (PE-RT). Cov kav dej yas no yuav tsum ua tau raws li lawv cov qauv khoom, piv txwv li, PP-R kav yuav tsum ua raws li GB / T 18742.2.
