It is a hydro phobic grout based on Poly-Urethane. Upon pounding with water it reacts to closed cell rubber like foam while expanding the volume up to 25 times. The huge material is of a constant volume. Since water is not a component of the foam structure, the cured material is essentially not affected by water or dryness. The reacted material does not shrink or swell. Depending on the pressure of injection, it reacts to a very dense material of foam.
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