MasterSpec Materials Rite-Water Stop Injection Resin (Rite-WS) is a solvent free, MDI-based water control and soil stabilization system. Rite-WS is hydrophilic and reacts with water to form either a flexible gel or an elastomeric foam depending on the amount of reaction water added to the mix
MasterSpec Rite-WS contains no measurable amount of TDI as performed by the Modified Analysis for Diisocyanates. Rite-WS is non-flammable, non-carcinogenic, and non-corrosive as defined by 40 CFR and as described in the NIOSH Pocket Guide for Hazardous Materials.
Rite-WS has NSF 61 approval for potable water contact and carries the Underwriters Laboratories UL seal.
Rite-WS is mixed with water at the work site to form a single injection material. The inert end product forms a water barrier which is essentially unaffected by acids, gasses, and organisms usually found in soil. A minimum of water (around 5% by volume) is needed for a reaction to occur, but large amounts can be accommodated through reaction or displacement.
Rite-WS is useful for a wide range of water control and soil stabilization applications, including grout curtains, stabilizing water-bearing soils, and sealing cracks or joints in concrete walls, buildings, dams and utility vaults.
Rite-WS may be placed by hand pumps or multi- ratio power pumps. Stainless steel fittings are recommended but not strictly required because Rite-WS is no more corrosive than water. Cleanup of solidified material in the system, however, is often accomplished with caustic cleaning compounds, making stainless steel advisable.
The low viscosity of Rite-WS makes it easy to inject. Once cured, its impermeability makes it an effective water shut-off system. The permeability of soil grouted with Rite-WS depends on how well its voids are filled with grout. Values in the 10-7 cm/sec range should be obtained using ASTM Constant Head Permeability Test Method D-2434.
A three-stage reaction takes place when Rite-WS mixes with an equal volume of water and foams. The mixture first thickens and becomes creamy. Then, carbon dioxide gas evolves rapidly, and the mixture expands as it cures. The expanded Rite-WS volume then sets into a strong impermeable water barrier. Unrestrained Rite-WS foam may expand up to 10 times its starting volume depending upon the degree of confinement applied to the expanding mass.
When Rite-WS mixes with a large volume of water (i.e. 10:1 or greater), the three stages of the foam reaction cycle are not visible in the reacting mass. Instead, a marked viscosity increase will be seen just before the mass solidifies.
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