MINISTRY OF FINANCE Order is hereby given, for stipulating silica fume (silicon dioxide not less than 80% by weight), which is a by-product derived from the manufacturing process of silicon or ferrosilicon and consistent with the definition of chemical compounds specified in Chapter Note 1 of Chapter 28 of "Customs Import Tariff", shall be classified under Tariff No. 2811.22.90 based on General Rules of Interpretation 1 and 6 of "Customs Import Tariff" (stipulation shall become effective from 1st, February 2021)