|
 |
|
Item
|
Index(GB/T 2899-2008)
|
|
Top quality
|
First quality
|
|
Barium sulphate (dry) ω/% ≥
|
98
|
97
|
|
Volatile on 105°C ω/% ≤
|
0.30
|
0.30
|
|
Water soluble ω/% ≤
|
0.30
|
0.30
|
|
Fe ω/% ≤
|
0.0040
|
0.0060
|
|
Whiteness ≥
|
94
|
92
|
|
Oil absorption /(g/100g)
|
10–30
|
10–30
|
|
PH value100g/L
|
6.5-9.0
|
6.5-9.0
|
|
Fineness ( residue on 45μm sieve) (45μm) /% ≤
|
0.20
|
0.20
|
Distribution of Particle size
| 10μm, % ≥ |
80
|
|
5μm, % ≥
|
60
|
|
2μm, % ≥
|
25
|
|
| |
|
