Table 2: API Standard Numerical Value Requirement for Drilling Grade Bentonite [24]

RHEOLOGICAL PROPERTIES
Ɵ600 RPM 30 Minimum
Ɵ300 RPM 23 Minimum
PLASTIC VISCOSITY 6-8 Minimum
APPARENT VISCOSITY 12-15 Minimum
YIELD POINT 3*PV or 50 Maximum
YIELD POINT/PLASTIC VISCOSITY 3 Maximum

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