Kev tu thiab tu ntawm ib puag ncig tus phooj ywg lub hnab

1. Muab lub hnab ntim khoom rau hauv qhov chaw qhuav thiab hnub ci pov thawj;
2. Nws yog nruj me ntsis txwv tsis pub nkag mus rau hauv cov khoom corrosive;
3. Siv tus kov kom zoo, txwv tsis pub nws yuav tawg thiab ua kom lub neej ua haujlwm ntawm lub hnab ib puag ncig;
4. Cov hnab ntim ib puag ncig feem ntau muaj qhov hnyav ntawm ib ncig ntawm 8 phaus.