Vari-Lok Injection Resin
Product profile summary
Stratathane ST-504 Vari-Lok Injection Resin is a solvent-free,
MDI-based water control and soil stabilization system. ST-504
is hydrophilic; it reacts with water to form either a flexible
gel or an elastomeric foam depending on the amount of reaction
water added to the mix. The inert end product of the reaction
with water then forms an effective water barrier. A minimum of
water (around 3% by volume) is needed for a reaction to occur,
but much larger amounts can be accommodated through reaction or
displacement. The water required for the reaction is usually added
by the applicator during injection but may sometimes be acquired
by the resin from its injection environment.
three stage reaction takes place when ST-504 mixes with 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 ST-504 volume then sets into a strong impermeable
water barrier. Unrestrained ST-504 foam may expand up to 10 times
its starting volume depending upon the amount of reaction water
and the degree of confinement applied to the expanding mass.
contains no measurable amount of TDI as performed by the Modified
Analysis for Diisocyanates. ST-504 is non-flammable, non-carcinogenic,
and non-corrosive as defined by 40 CFR and as described in the
NIOSH Pocket Guide for Hazardous Materials.
has NSF 61 approval for potable water contact and carries the
Underwriters Laboratories UL seal.
ST-504 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. An ST-504 seal will tolerate freeze-thaw,
wet-dry cycling, extrusion, and compression to a substantial degree.