Hydrophobic Polyurethane is usually used to fill voids and stabilize soil because of its low viscosity, high expansion rate, and ability to set up under wet conditions without diluting.
Hydrophobic resin repels water. When injected into loose soil or voids, it expands and displaces any water present. Rigid-hydrophobic-soil-stabilization material expands up to 2,900% in soil and forms a strong, impermeable mass.
Hydrophilic resin absorbs water. Hydrophilic soil stabilization material absorbs as much water as it comes into contact with during initial cure. This absorption allows the resin to be extended with water. The end result is a gelatin type product that doesn't add much strength, but is impermeable to water.
When the water table drops, moisture in the hydrophilic stabilization product evaporates and the products shrink. Our testing has shown that re-absorption recovery only ranges from 60-80%.
Because rigid hydrophobic material is not affected by fluctuation in the moisture content of soil, it is virtually unaffected by water table level. It retains its strength, size, and impermeability under almost all soil conditions.
Prime-Flex 910 is an extremely low viscosity rigid foam that will penetrate the finest soils. The set time can be adjusted from over one hour for slow penetration to 30 seconds for penetration rapid enough to cut off underground streams.
Prime-Flex 920 will expand up to 2,900% to fill voids behind tunnel liners, manholes, under concrete slabs, etc... The set time can be controlled using an accelerator. Prime-Flex 920 viscosity is low enough to be used for soil stabilization.
