>Chivundikiro cha mphira, chomwe chimapangidwa kuchokera ku zinthu zolimbana ndi mankhwala, chimakhala ndi corrosiveness yabwino komanso katundu wabwino.
> Zimapangidwa mwapadera kuti zigwire zinthu zomwe zingasungunuke, kukulitsa kapena kuwononga lamba.
> Ndiloyenera kunyamula zinthu zokhala ndi corrosiveness yamankhwala m'mafakitole amankhwala, mafakitale a feteleza wamankhwala, mphero zamapepala, mafakitale amigodi, ndi zina zambiri.
