UST is a preformed expanding foam tape sealant. It is made by
impregnating a resilient, high-density, open-cell polyurethane foam with water-based,
stabilized acrylics. It is supplied factory precompressed and packaged in reel form with
self-adhesive backing for use in preformed joints subject to expansion and contraction
movement, and also as gaskets in tightly squeezed, non-moving joints.
After removal of packaging,
material begins gradual expansion--slowly in cold weather, faster in hot.
Sealing ability is a function of
the characteristics of the open cell foam structure, the level of impregnation, and the
degree of compression or density which can be varied to suit specific applications. For
example, lower compression serves for dust, driving snow, etc., while progressively
greater compression is required for vertical run-off water, etc.
precompressed to less than the nominal material size for easy
insertioninto a preformed joint of the same opening
Sealing between the foam and
substrate is achieved through a combination of the pressure-sensitive adhesive
impregnation and the back pressure of the expanding foam.
As a water, vapor, air, sound and dust seal
between metal surfaces, as well as between concrete and other substrates.
For applications requiring high temperature
Ideal as a gasket tightly squeezed between joint
faces that are mechanically fastened together such as lap seams.
Its resilience makes it also suitable for use
in a partly expanded condition for filling preformed openings between components and where
joint opening size varies due to seasonal temperature changes.
applications where damping vibration and noise is as important as weather sealing.
a secondary seal behind caulk.
Does not dry out.
Durable, resilient, therefore
suitable for moving joints.
Tolerant of joint face
Ideal as a secondary seal to wet
Compatible with and adheres to
most wet sealants.
Does not bleed.
Back pressure of foam maintains
seal, minimizes tension on substrate, and reduces possibility of failure due to weak or
improperly prepared substrates.
Exposed face remains virtually
flat regardless of variation and changes in joint width and compression.
User friendlyno masking, mixing, priming, tooling, curing
or clean-up required.
Good thermal and sound
Difficult to vandalize.
UST will not adhere to joints that are dirty or dust-covered or to
surfaces coated with oils or release agents.
UST service temperature range is
-40°F to 249°F (-40°C to 120°C).
Substrate faces must be parallel and have
sufficient clear depth to fully support
Substrate must be capable of resisting,
without deflection, approximately 1.5 to 2.5 lb/in2 (10 to 17 kPa) back pressure from the
Surface Preparation: Joint surfaces must be
free from gross irregularities, loose particles, foreign matter such as dirt, dust, ice,
snow, water, etc., and coatings such as grease, oil, release agents, lacquers, etc., that
may be detrimental to the adhesion of the sealant.
UST should be stored indoors at room temperature. Recovery is quicker when warm and slower when
Remove UST from protective packaging.
self-adhesive side by removing release liner.
Standard or project-specific warranties
are available from EMSEAL on request.
EMSEAL products are available internationally. The product range is continually being
developed, and EMSEAL reserves the right to modify or withdraw any product without prior