The current API specifications for drilling grade bentonite are: Viscosity: Reading of 30 at 600 r/min. Yield Point/Plastic Viscosity Ratio: 3, maximum. Filtrate Volume: 15 mL, maximum. Residue of diameter greater than 75 microns: 4 % by weight, maximum. As with all the testing done at Global Energy Laboratories, the bentonite testing is done ...
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