NAC534.194. “Sodium bentonite” defined.  


Latest version.
  • “Sodium bentonite” means a colloidal clay that:

         1. Consists primarily of the weathered volcanic clay mineral montmorillonite where sodium is the predominant, exchangeable cation;

         2. Has the ability to swell; and

         3. Is easily hydrated when mixed with fresh water to form bentonite drilling fluids or bentonite grout.

     (Added to NAC by St. Engineer, eff. 12-30-97; A by R039-12, 6-29-2012)