Ifu ya silicon ni umusaruro ukomoka kuri silicon na ferrosilicon by'icyuma gishongesha. Ni ubwoko bw'ibishishwa bireremba ku itanura mu gihe cyo gushongesha silicon. Ibikubiye muri yo biri hagati ya 45% na 70%, naho ibindi ni C,S,P,Al,Fe,Ca. Ihendutse cyane kurusha icyuma cya silicon gisukuye. Aho gukoresha ferrosilicon mu gukora ibyuma, bishobora kugabanya ikiguzi.
