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Enviroplug Medium is made of pure 'Wyoming Bentonite', and was the first bentonite chip developed and marketed. Enviroplug Medium swell to fill voids, exerting pressure against all surfaces to create a flexible low permeability seal. Since Enviroplug is introduced in a dry state, shrinkage cannot occur and there is a reserve expansion capacity. Products you selected Request this quote Clear list Categories View by Division View by Brand Enviroplug Medium Product #11047 Enviroplug Medium Enviroplug Medium is made of pure 'Wyoming Bentonite', and was the first bentonite chip developed and marketed. Enviroplug has been used for abandoning holes since 1983. Enviroplug is used in sealing and plugging applications. Enviroplug Medium swell to fill voids, exerting pressure against all surfaces to create a flexible low permeability seal. Since Enviroplug is introduced in a dry  state, shrinkage cannot occur and there is a reserve expansion capacity. Generally hydration takes 1 to 2 hours. Enviroplug is an exceptionally versatile product used for abandoning cased and uncased boreholes, sealing casing, isolating zones, sealing grounding rods and heat pump conductor holes, stemming and sealing seismic shot holes, sealing excavations, and for any vertical sealing to prevent water movement up or down a borehole.