... is an all-purpose filler materials due to identical grain size,stable lustre,and excellent dispersion.2.Technical Parameter ... 0.5Bulk density, g/cm3 ≤0.87Specific Surface, cm2/g ≤8000Settling value, ml/g ≥---Top Cut(D98), μm ≤35Average Grain(D50), μm ≤16Fe, % ≤0 ... .1Mn, % ≤0.08Residues: 325μm, % ≤ 125μm, % ≤0 0.6Whiteness(R457), % ≥93Absorption oil ...