SiO2, %≥92    Color: Equivalent to standard sample   Sieve residue (45μm), %≤0.5

Sieve residue (45μm), %≤0.5   Loss on Heating % 4-8  Loss on Ignition % ≤7

pH:5-8   Cu, mg/kg≤30   Mn, mg/kg≤50     Fe, mg/kg ≤1000   DBP absorption, cm3/g ≥2.3-2.8

Specific surface area m2/g:140-200     Tensile strength, MPa ≥19.0   Rupture elongation, %≥675