0xjt sjlic (sio2) 
-la oxjt wan trog thu 2 sau oxjt canxj,sio2 chu yeu do dat set cug cap chjem 21-26% tp hoa clk xm,khj nug luyen clk sio2 td voj Cao tao ra cac khoag silicat day la nhug khoag quyet/ djh cuog do va thoj jan dog ket of xm.
-neu sio2 tag thj cac khoag silicat tag nhug (chu yeu la c2s tag) xm chua nhju c2s co thoj jan dog ket lon toa jt nhjet khj dog ran co do ben vjnh cuu cao ben trog nc va moj truog xam thuc nhug sio2 co nhjt do nog chay cao nen kho nug kho tao khoag c3s.
-neu sio2 jam thj nguoc laj luc tag.