Product profile summary
Stratathane ST-540 is one part of a plural component urethane
resin system for sealing cracks in concrete and brick structure.
ST-540 mixes with ST-541 to form a dense flexible solid in the
leak path. The set time of the mixture can be controlled by ST-542
accelerator and ST-544 is available as a filler. ST-540 has outstanding
resistance to water. It has a low liquid-state viscosity. The
cured product is physiologically harmless and may be used under
controlled conditions in contact with potable water. Stratathane
ST-540/541 is a two component urethane resin used for elastic
sealing of cracks in concrete and brick structures. ST-540 mixes
with ST-541 (the "B" isocyanate component) to form a
dense flexible solid in the leak path. The set time of the mixture
can be controlled by use of ST- 542 accelerator. ST-544 is available
as a filler.
Stratathane ST-540 is the name for a very elastic polyurethane
resin from Strata Tech which is used for sealing leaking cracks
and expansion joints in concrete structures and for controlling
the movement of water through soil and rock fissures. Stratathane
ST-540 resin is ideal for sealing wet or moving cracks in concrete
because their elastic properties help to avoid further cracks.
Stratathane resins are indicated for use when water cutoff is
the main objective, cracks move often, and a rigid seal is undesirable.
The elastic Stratathane seal allows a structure to move at the
existing crack to help control formation of new cracks caused
by shifting stress. This flexible control of stress-transfer means
that concrete repaired with Stratathane will normally not crack
again. The seal also protects reinforcing bars from water, salts,
gases and other oxidizers.
Stratathane ST-540 can be placed with both small and large pumps,
from grease guns and simple hand pumps to high capacity, air powered,
multi-ratio units. Stratathane ST-540 has been used to repair
large and small cracks and expansion joints in buildings, dams,
tunnels, utility vaults, electrical conduits, and sewers. Stratathane
ST-540 resin seals are not affected by water in the cracks and
cavities to be repaired as long as proper application procedures
The ST-540 resin system itself is solvent and filler free and
has outstanding resistance to water. It's low liquid-state viscosity
makes it easy to place. The cured product is physiologically harmless
and may be used under controlled conditions for crack injection
in contact with potable water. The elastic seal created by ST-540/541
allows a structure to move at the existing crack, thereby eliminating
additional cracks caused by shifting stresses. The seal also protects
reinforcing steel from contact with water, salts, gases and other
ST-542 Accelerator may be added to the mixture when an adjustment
of set time is necessary. Field experience, will determine appropriate
set time for particular applications. ST-542 must always be added
to ST-540 before mixing with ST-541.
After curing, ST-540/541 demonstrates excellent adhesion to concrete
and can withstand considerable movement. Water pressure will not
affect the cured resin at heads usually encountered in repair
work. Cavities and cracks which contain flowing water are handled
by adjustment of the set time.
ST-540 has been used to repair cracks and expansion joints in
buildings, tunnels, subgrade structures and storm and sanitary
sewers. Quantities required for a given repair may vary and will
usually be determined by field tests.
The mix ratio is two parts by volume of ST-540 and one part by
volume of ST-541. Clean sand may be added as a filler (depending
an the application) from two parts up to as much as eight parts
of sand to one part of ST-540.
For a specific determination of resistance to an anticipated chemical
exposure, a testing program is required. However, the following
resistance table for urethane in general may give an indication
of the chemical resistance behavior.
ST-540 resin is not resistant to acetone, alcohol, benzene or
toluene chlorinated solvents.
POTABLE WATER CONTACT
Air cured samples of ST-540/541 have been tested by a major hygiene
institute for possible effects on the quality of potable water.
A discussion of the report is available on request..