Enviroplug No. 8, 16 and 20 are high-swelling Wyoming Bentonites 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 pumpable slurry, the fine granules expand against casings and formations to create a very low permeability flexible grout seal.