items\Type

 first grade

second grade 

third grade

 fourth grade

Green Comp Strength , kpa ≥

 100

70

50

30

 Dry Comp. Strength, kpa ≥

 2.5

2.0

1.5

0.5

 MBI,g/100g

 32

28

25

22

Mesh(through B.S.S.200 sieve,%≥

 85

85

85

85

 Moisture % 

9~13

 9~13

 9~13

 9~13

Ingredients

%

Sodium Bentonite

Ca-bentonite

SiO2

%

69.32

67.23

Al2O3

%

14.27

15.88

CaO

%

1.99

2.22

MgO

%

2.69

4.01

K2O

%

1.38

0.19

Na2O

%

1.85

0.13

Fe2O3

%

1.84

2.62

FeO

%

0.63

0.03

MnO

%

0.10

0.00

TiO2

%

0.13

0.13

P2O3

%

0.04

0.06

LOI

%

5.67

8.09

Sodium Bentonite

Ca-bentonite

Grade

2 items

Three Goods

Grade

2 items

Three Goods

Water absorption (2h) /% ≥

400

300

200

200

160

120

Blue absorption capacity/(g/100g) ≥

30

26

22

30

26

22

Swelling Index/(mL/2g) ≥

15

5

Sieving ratio (75μm, dry sieving), mass fraction /%≥

98

95

95

98

95

95

Water (105 ° C). Mass fraction /%

9-13

9-13

project

Drilling Bentonite

Untreated bentonite

OCMA Bentonite

Viscometer readings 600r/min≥

30

30

Yield Value / plastic viscosity≤

3

1.5

6

Filtration volume / cm 3≤

15.0

16.0

75μm sieve, mass fraction /% ≤

4.0

2.5

Dispersed plastic viscosity / (mPa · S)≥

10

After filtration the amount of scattered / cm 3 ≤

12.5

Water (105 ° C). Mass fraction /% ≤

13.0

project

Drilling Bentonite

Untreated bentonite

OCMA Bentonite

Viscometer readings 600r/min≥

30

30

Yield Value / plastic viscosity≤

3

1.5

6

Filtration volume / cm 3≤

15.0

16.0

75μm sieve, mass fraction /% ≤

4.0

2.5

Dispersed plastic viscosity / (mPa · S)≥

10

After filtration the amount of scattered / cm 3 ≤

12.5

Water (105 ° C). Mass fraction /% ≤

13.0