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ITEM Specifications Typical values Size, μ m 280-600 300 Qualified size ratio, % >> 94 96 Free acid (hydrochloric acid), %<< 0.05 <0.05 Pore volume, ml/g >> 0.5 0.8 Ignition loss, %<< 3.0 1.2 Iron (Fe), %<< 0.015 <0.015 Fuming sulphuric acid test %<< White White Specific surface area, ㎡/g 300-400 300
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