Items Column 2 Column 3
Ti O2; content, % (m/m), not less than ASTM D476 93
Rutile content, % (m/m), not less than ASTM D476 98
SiO2 content, % (m/m), less than ASTM D476 0,1
Al2O3 content, % (m/m), less than ASTM D476 2,5
Brightness %, not less than ASTM D476 94.5
Tint reducing power, Reynolds Number (TCS) not less than ASTM D476 1900
Volatile matter at 105 degree Celsius, % (g/100g), less than ASTM D476 0.5
Water soluble matters, less than ASTM D476 0.5
PH value in water ASTM D476 6.5 – 8.5
Oil absorption, % (m/m), ASTM D476 16-18
Electrical resistance of aqueous extract Ωm not less than ASTM D476 80
Residue matter on 45 µm sieve, % (m/m) less than ASTM D476 0.02
Whiteness (compared with standard sample) ASTM D476 100.0
Oil dispersion (Hegmann number) not less than ASTM D476 5.0