BENSEAL® granular (8-mesh), natural Wyoming sodium bentonite is used in the sealing and grouting of well casings and earthen structures. BENSEAL is not recommended for use as a drilling mud.
BENSEAL sealing and plugging agent assists or promotes the following:
y Seal or grout plastic or steel casings in monitor and water well construction y Seal or plug abandoned boreholes y Seal leaking ponds, ditches and dams y Soil stabilization y Prepare BENSEAL and EZ-MUD® grouting system y Aid in controlling loss of circulation
Advantages y High swelling capacity y Uniform particle size y No heat of hydration y Prevents commingling of aquifers and contamination from surface y Forms a flexible seal to protect casing from corrosive contaminants y Allows for hole re-entry y NSF/ANSI Standard 60 certified
y Appearance y Dry screen analysis y Volume, ft3 /sack y Specific gravity y Permeability
Bluish to gray granules 85% as 8 mesh 0.7 (as packaged) 2.6 less than 1 x 10-8 cm/sec (in fresh water)
As a casing drill and drive operation:
1. Dig a cone-shaped depression around casing. Depression should be 6 – 8 inches (152-203 mm) larger than the outside diameter of the casing and 2 – 3 feet (60-75 cm) deep. 2. Keep cone-shaped depression filled with dry BENSEAL while driving the casing