Na-eji: Kwesịrị ekwesị maka bọọdụ gypsum, keel osisi, njikọ mgbidi, mgbidi nkebi dị fechaa na nrụnye n'uko ụlọ.
Ngwọta dị n'elu: phosphate ojii/zinc na-acha anụnụ anụnụ / zinc plating
Ihe onwunwe: carbon ígwè
![`4NNW{5P]H${371$2K`O]PI](http://www.hbunisen.com/uploads/4NNW5PH3712KOPI-284x300.png)
