Granular bentonite used for sealing dry driven casing. Enviroplug® No.8 and No.16 and No.20 are high-swelling Wyoming Bentonite in granular form. The unique molecular structure allows them to absorb five times their weight of water and swell to a volume of 12 to 16 times their dry bulk, making it an ideal well sealant. Applied dry or in a pump-able slurry, these fine granules expand against casings and formations to create a very low permeability flexible grout seal. 70 BAGS PER PALLET.