national standard

GB1706-93（BA01-01）

internal control specification

first grade

first-class

conformance

first grade

first-class

Purity TiO₂，%（m/m）                   ≥

98

98

98

98.0

98.0

Color compare with standard

approximity 

not lower than

slightly worse than

not lower than

slightly worse than

Tinting strength compare

   with standard,  %               ≥

100

100

90

100

90

Matter volatile at

   105℃,  %（m/m）                ≤

0.5

0.5

0.5

0.5

0.5

Matter volatile at

   105℃ pretreated at （23±2）℃ and relative humidity (50 ± 5) %  for 24h,                        ≤

0.5

0.5

0.5

0.5

0.5

Water soluble  %                         ≤

0.4

0.5

0.6

0.5

0.6

PH of suspension,aqueous

   solution retainted, % 

6.5-8.0

6.5-8.0

6.0-8.5

6.5-8.0

6.0-8.5

Oil absorption, g/100g                    ≤

22

26

28

26

28

Residue on sieve 45um, % m/m

0.05

0.10

0.30

0.10

0.30

Resistivity of aqueous extract， Ωm                ≥

30

20

16

20

16

First grade ratio  %                         ≥

95

qualified package weight rate       %

100