BAROID® bentonite pellets are compressed; shaped pellets of high-yielding; untreated Wyoming bentonite. BAROID bentonite pellets are available in three sizes: 1/4"; 3/8"; and 1/2". Applications/Functions: Can seal or grout plastic or steel casing; Can isolate screen intervals; subsurface instrumentation; and sampling zones; Can provide a protective interface between gravel pack and cement grout; Can plug abandoned earthen boreholes and cavities; Can create a stable; permanent below-grade seal in: monitor/observation wells; dewatering holes; caisson holes; soil sampling holes; mineral exploration holes; water wells. Advantages: High swelling capacity in the presence of fresh water; No heat of hydration; Re-hydratable; After hydration; forms a semi-solid; flexible seal with permeability less than 1 x 10-8 cm/sec.