Ana yin bututu marasa ƙarfi daga bututun bututu na ƙayyadaddun ƙayyadaddun abubuwa daban-daban ta hanyar extrusion mai zafi mai zafi, sanyaya, cirewa, ƙarewa da sauran matakai. Yana daya daga cikin manyan nau'ikan karafa guda hudu da ake ginawa a kasata. An fi amfani da shi don jigilar ruwa kamar ruwa, mai, g ...
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