HOLEPLUG® naturally occurring Wyoming sodium bentonite clay is a sized and graded chip material used to seal and plug earthen boreholes. HOLEPLUG bentonite is available in two particle size grades: HOLEPLUG bentonite 3/4" (100% of particles pass through 3/4" screen; all particles retained on 3/8" screen); HOLEPLUG bentonite 3/8" (100% of particles pass through 3/8" screen; all particles retained on 1/4" screen). Applications/Functions: Highly recommended for use in grouting annulus in all types of wells; particularly environmental monitoring well applications; Can seal above gravel packs; Can plug decommissioned boreholes; Stemming shotholes; Can seal around conductor pipe; Can seal lost circulation zones; Can shut off artesian flow. Advantages: Helps prevent entry of surface water into boreholes; High swelling potential; In situ swelling to provide a superior seal with excellent casing stabilization; Easier to apply than pellets; Cost effective; Simple to apply; mixing not required; Helps prevent vertical movement of fluids in the hole between porous zones; Helps form a permanent; flexible downhole seal; Helps allow hole re-entry; Rehydratable; NSF/ANSI Standard 60 certified.