... ,this product can highten viscosity, hydrophily,lubricationg and suspension Bentonite for drilling With the good capacity of colloid,this product can ... structure,and can take the rock fragments,avoid of broken bits from the well ,sloughing and leaking stoppage.The main technical ... ≤33Filtrate Volume cm3 ≤15475μm residue on sieve% ≤4 bentonite for drilling