
| Item/Type | First Grade | Second Grade | Calcium Base Bentonite |
| Methyl blue absorption g/100g ≥ | 32 | 32 | 30 |
| Colloid value % ≥ | 500 | 400 | 480 |
| Swelling value ml/g ≥ | 50 | 20 | 10 |
| PH value | 8.0-9.5 | 8.0-9.5 | 6.5-7.5 |
| wet compressive strength gf/m2 ≥ | 100 | 80 | 30 |
| Hot wet tensile strength kg/cm3 > | 3.0 | 2.0 | 1.5 |
| Moisture% ≤ | 10 | 10 | 10 |
| Fineneess(pass 200mesh screen) ≥ | 95 | 95 | 95 |