ST-526 Poly-Foam Ultra Injection Resin

ST-526 Product profile summary
Stratathane ST-526 Poly-Foam Ultra is a hydrophilic, single component, 100% solids, flexible polyurethane resin based on MDI for sealing leaks in concrete and masonry structures. ST-526 Poly-Foam Ultra reacts with water, expands, and then sets into a flexible closed-cell foam. ST-526 is mixed with water at the work site to form a single injection material. ST-526 is odor-free and contains no volatile organic compounds (VOCs). ST-526 is essentially non-toxic in its cured form.

ST-526 is injected directly from the can into the leak using either a single or a plural component pump. When ST-526 reacts with water, its elastic seal stops water entry but allows crack movement to protect against stress transfer. The cured material exhibits excellent adhesion to concrete and is not corrosive. At 70 F, reaction time is approximately 30 seconds and cure time about two minutes. It has no preset "pot life" and does not cure as long as water or moisture vapor are not available to start the cure cycle.

A two stage reaction takes place when ST-526 comes in contact with water. The mixture first expands and thickens. Then, as it cures, ST-526 quickly solidifies into a strong impermeable water barrier in just minutes. Unrestrained ST-526 foam expands up to ten times its starting volume. However, a dense material is preferred for most applications. Greater density is obtained by controlling grout placed relative to void space and static head pressure. ST-526 tolerates freeze-thaw, wet-dry cycling, extrusion, and compression.

Stratathane ST-526 contains no measurable amount of TDI as performed by the Modified Analysis for Diisocyanates. ST-526 is non-flammable, non-carcinogenic, and non-corrosive as defined by 40 CFR and as described in the NIOSH Pocket Guide for Hazardous Materials.