BENSEAL® granular (8-mesh); natural Wyoming sodium bentonite is used in sealing and grouting well casings and earthen structures. BENSEAL sealing and plugging agent is not recommended for use as a drilling mud. Applications/Functions: Seal or grout plastic or steel casings in monitor and water well construction; Seal or plug abandoned boreholes; Seal leaking ponds; ditches and dams; Soil stabilization; Prepare BENSEAL and EZ-MUD® grouting system; Aid in controlling loss of circulation. Advantages: High swelling capacity; Uniform particle size; No heat of hydration; Prevents commingling of aquifers and contamination from surface; Forms a flexible seal to protect casing from corrosive contaminants; Allows for hole re-entry; NSF/ANSI Standard 60 certified.