ST-524 Poly-Foam Injection Resin

ST-524 Product profile summary
Stratathane ST-524 Poly-Foam Active is a hydrophobic two component, flexible polyurethane resin based on MDI. ST-524 Poly-Foam is highly sensitive to water and reacts with very small amounts to set into a flexible closed-cell foam. ST-524 is mixed with ST-525 accelerator at the work site to form a single injection material whose reaction time with water is governed by temperature and by the concentration of ST-525 in the blend.

Stratathane ST-524 contains no measurable amount of TDI as performed by the Modified Analysis for Diisocyanates. ST-524 is non-flammable, non-carcinogenic, and non-corrosive as defined by 40 CFR and as described in the NIOSH Pocket Guide for Hazardous Materials. ST-524 is essentially non-toxic in its cured form.

ST-524 has NSF 61 approval for potable water contact and carries the Underwriters Laboratories UL seal.

ST-524 is injected directly from the can into the leak using either a single or a plural component high pressure pump. When 20 parts of ST-524 react with one part of water, a two stage reaction takes place. The resulting mixture first expands and then quickly fills the leak path with an elastic seal that stops water entry but allows crack movement to protect against stress transfer. ST-524 has no preset "pot life" and does not cure as long as water or moisture vapor are not available to start the cure cycle.

When ST-524 comes in contact with water, the mixture first expands and then quickly thickens. As it cures, ST-524 solidifies into a strong impermeable water barrier in just minutes. Unrestrained ST-524 foam expands up to ten times its starting volume. However, a dense material is preferred for most applications, so greater density is obtained by controlling grout placed relative to the available void space and static head pressure.