Pre-Compressed, Self Expanding, Gasket and OEM Sealant Tapes

UST Sealant Tape for Telecommunication Shelters


Sealing Telecomm Shelters

Telecommunication shelters must be watertight.

Liquid sealant (caulk), alone, is not protection against long-term water infiltration.  Backing up the caulk with UST Impregnated Sealant tape will provide lasting protection.

Not only do telecomm shelters house critical electronics, but telecomm shelters are usually located at the full mercy of the weather. 

Extremes in heat, cold, as well as pummeling from rain, snow, sleet and driving winds leave these critical structures totally exposed.

In the highly competitive market of telecomm shelter manufacturing, a watertight, maintenance-free sealing solution is an essential offering.


Product Description
   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.

UST is supplied precompressed to less than the nominal material size for easy insertioninto a preformed joint of the same opening width.

   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.

 Uses, Applications

  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 stability.

  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.

  In applications where damping vibration and noise is as important as weather sealing.

    As a secondary seal behind caulk.

  Does not dry out.
   Durable, resilient, therefore suitable for moving joints.
   Tolerant of joint face irregularities.
   Ideal as a secondary seal to wet sealants (caulk).
   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 friendly
no masking, mixing, priming, tooling, curing or clean-up required.
   Good thermal and sound insulating properties.
   Difficult to vandalize.

   Vermin resistant.


  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 

    -40F to 249F (-40C to 120C).

Joint Design

   Substrate faces must be parallel and have sufficient clear depth to fully support UST.

   Substrate must be capable of resisting, without deflection, approximately 1.5 to 2.5 lb/in2 (10 to 17 kPa) back pressure from the UST.


   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 cold.

   Remove UST from protective packaging.

   Expose self-adhesive side by removing release liner.


Standard or project-specific warranties are available from EMSEAL on request.

Availability and Price
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 notice.


Why liquid sealants alone are not a watertight solution

While they provide aesthetic benefit, liquid sealants (caulk) lose effectiveness for many reasons:
-   poor initial adhesion to exposed aggregate
-   poor adhesion caused by dust and concrete particles

-   failure to create "hour-glass" required for proper liquid sealant performance

-   failure to tool sealant to promote proper adhesion

-   loss of key physical properties (UV resistance, modulus) over time and temperature.

Furthermore, structures sealed with liquid sealants must be recaulked as an ongoing maintenance commitment.  This is difficult and extremely costly given the often remote location of these units.

For these reasons, providing a secondary seal of impregnated foam sealant will ensure that leaks do not occur even when the caulk fails.


Liquid-Sealant Failure 2.JPG (91426 bytes)
Dark lines beside caulk show adhesive failure.

Liquid sealants (caulking) are widely misused. They do not work to fill voids, cannot function if too much is used, and cost manufacturers a fortune in wasted material.  UST does fill voids and can be used to control liquid sealant depth thereby eliminating waste and ensuring a geometry that will allow the liquid sealant to function.


Liquid Sealant Glop.jpg (67465 bytes)

Product Data.pdf
Installation Sheet.pdf

Call us now at:
1-800-526-8365 or 508-836-0280

Contact us @ techinfo@emseal.com or for

Specialty Sealant & Gasket Applications

Contact: Bob O'Hayer
PH: 207-853-3107    CELL:
FAX: 610-743-8486

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