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.

Moisture % max

0.25

With SARHORIUS MA30 moisture meter to test models.

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