Specification of [API 13A SEC. 9] Grade bentonite physical requirement
| Requirement | Standard |
Suspension properties
- Viscometer dial reading at 600 r/min
- Yield point /plastic viscosity ratio
- Filtrate volume
|
- minimum 30
- maximum 3
- maximum 15.0 cm3
|
| Residue of diameter greater than 75m | maximum mass fraction 4.0 % |
