as follows:detail specification Specification: SiO2, %≥92 Color: Equivalent to standard sample Sieve residue (45μm), %≤0.5Sieve residue (45μm), %≤0.5 Loss on Heating % 4-8 Loss on Ignition % ≤7pH:5-8 Cu, mg/kg≤30 Mn, mg/kg≤50 Fe, mg/kg ≤1000 DBP absorption, cm3/g ≥2.3-2.8Specific surface area m2/g:140-200 Tensile strength, MPa ≥19.0 Rupture elongation, %≥675