Ma bols 625 amatha kugwiritsidwa ntchito m'malo osiyanasiyana chifukwa cha kuthekera kwawo popewa kupsinjika, kupindika chipongwe ndi kuwononga. M'mapulogalamu odekha monga mlengalenga, madzi atsopano kapena amchere, mchere wamchere wa alkaline amalekerera kwathunthu. M'milandu yovuta kwambiri, nickel ndi chromium okhutira amaletsa kugwiritsa ntchito mankhwala oxidi. Ma bollise 625 amagonjetsedwanso ndi malo osakhala oxidi.