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Silica fume hs code factory

Silica fume HS code: 25120090

Silica fume with less than 1µm is more than 80%, the average particle size is 0.1 – 0.3 um, pecific surface area: 20 – 28m2/g. The fineness and specific surface area are about 80-100 times of the cement and 50-70 times of the fly ash.

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