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See Chinese contents: GB/T 21236-2007 GB/T 21236-2007: Silica fume from electric-furnace
This Standard specifies the designations, technical requirements, test methods, inspection rules, packaging, marking, storage, transport, and quality certificates of silica fume products. This Standard applies to the silica fume that is collected by dry dust collectors from oxidized and agglomerated silica-bearing fume that is gathered by the fume hood of electric-furnace in ferrosilicon or industrial silicon production.
