Kev tawg-pov thawj kiv cua impellers yog feem ntau yog ua los ntawm aluminium alloy, uas muaj kev txhim khu kev qha tawg-pov thawj. Rau ib puag ncig uas xav tau kev tiv thaiv corrosion ntxiv, fiberglass yog qhov pom zoo xaiv. Ob qho khoom siv, aluminium alloy thiab fiberglass, muaj txiaj ntsig zoo hauv kev ua kom muaj kev nyab xeeb tawg.
Lawv muab qhov tsim nyog lub zog thiab kav ntev, thaum tseem hais txog tej teeb meem ib puag ncig xws li tshuaj corrosive los yog huab cua phem. Lawv qhov kev xaiv yog qhov tseem ceeb hauv kev tswj xyuas ob qho tib si kev ncaj ncees ntawm cov kiv cua thiab kev nyab xeeb ntawm thaj chaw ib puag ncig, ua rau lawv zoo tagnrho rau ntau hom kev lag luam.