| ITEM |
PRECIPITATED |
TEST METHOD |
|
Barium Sulphate %
(dry base) |
≥98.0 |
Weight
GB/T2899-1996 |
| Particle size (Micronmeter) |
1.8±0.1 |
Laser analytical instruments |
| Volatility at 105℃% |
≤0.20 |
Weight
GB5211.3-85 |
| True Specific Gravity (g/cm3) |
4.4 |
API STD 13A with the norms of the test. |
| Soluble in water% |
≤0.30 |
Hot-extraction
GB/T5211.2-2003 |
| Fe % |
≤0.006 |
Spectrophotometer
GB3049-86 |
| Whiteness % |
98±0.5 |
Whiteness meter
GB/T5950-1996 |
| Oil absorption (g/100g) |
16-18 |
Pigment absorbing oil
GB5211.15-88 |
| PH Value |
6.5±0.5 |
Acidity meter
GB1717-86 |
| Screen (over 45µm)% |
≤0.0015 |
45µm wet screen
GB/T2899-1996 |
| 10 (Micronmeter) |
0% |
Laser scattering & diffraction |
| 5 (Micronmeter) |
1% |
Laser scattering & diffraction |
| 2 (Micronmeter) |
99% |
Laser scattering & diffraction |
|
|
|
