Poly-Foam Injection Resin
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.
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.
has NSF 61 approval for potable water contact and carries the
Underwriters Laboratories UL seal.
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.
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.