Item denomination Fducial mark Titanium dioxide (tio2) content% ≥ 98% Whiteness of the standard% ≥ 100% Achromatic power of the standard% ≥ 100% 105 ℃ volatile (m \ m)% ≤ 0. 3 Water capacity material (m \ m)% ≤ 0. 2 PH value of aqueous suspension 6. 5 ~ 8. 5 Oil absorption g/100g ≤ 23 Sieve residue% 320 Head sieve ≤ 0. 1 Hiding power of the standard% ≥ 100% Water extract of resistivity, Ωm ≥ 50