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

MST--Multi-Use Sealant Tape

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Some of the many uses for EMSEAL MST:

Metal Roofs

Building Seams and other metal construction surfaces

Sill Plates and other ground level water seams

Window Wells

Walks, Driveways and concrete joining other materials

Bulkheads and precast basement steps

Window Casings and other perimeters

Storm Door and other door frames

Truck Caps

AC Window Units

...hundreds of other uses and applications



MST- Multi-Use Sealant Tape.pdf

MST- Multi-Use Sealant Installation Sheet.pdf

Product Innovation:
MST Multi-Use Sealant Tape features a breakthrough in sealant technology. The innovation comes in the composition of the acrylic adhesive infused into the cellular foam base material. This new proprietary chemistry incorporates a hydrophobic component never before available in a sealant formulation.

The result is a material that features sealing performance significantly greater than any acrylic impregnated predecessor. In addition, it is odorless, clean handling, UV stable, non-staining, and highly versatile.

Product Description:
MST Multi-Use Sealant Tape is a preformed expanding tape seal. MST is made of a resilient cellular foam infused with a hydrophobic, modified-acrylic, liquid adhesive sealant which is then compressed to a sealing density level appropriate to the application. The result is a hybrid sealant that features the best characteristics of foam and liquid sealants while eliminating their respective weaknesses. MST compresses uniformly without overspill to provide a lasting seal.

MST is available in a wide variety of configurations. Users determine the size of MST suited to their specific application and performance needs. Typically, higher compression levels are required for watertightness in standing water or water run-off applications; lower compression can be used, for example, for snow seals at roof ridges (see compression chart on Page 2).

MST replaces and outperforms liquid and butyl-tape sealants as well as closed cell and unimpregnated open-cell foam closures.

EMSEAL MST is packaged precompressed in rolls. The material contains a pressure sensitive mounting-adhesive on one face to facilitate installation.

Product Uses:
sealant tape is used to seal out dust, air, wind-driven snow, and moisture from joint details in metal buildings, panels, roofs, and other building components and assemblies. MST is ideal as a filler in expansion/compression joints subject to movement from thermal expansion and contraction, and as a gasket in mechanically fastened, non-moving applications.

MST can be used against metal, plastic, wood, concrete, and other common building materials.

Product Features:
• Clean handling, non-staining, odorless, UV-stable
• Resistant to bugs and vermin
• Will not extrude from between joints like caulk or butyl tapes
• Conforms to contours and fills gaps
• Maintains a seal during thermal expansion and contraction of building panels
• Good thermal and sound insulator
• No shrinkage or blow-out due to closed-cell breakage


Compression Levels

Higher levels of compression offer greater protection


* Watertight up to 5 PSF per ASTM E-331 modified to run 24 hours instead of standard 15 minutes. This equates to a 1-inch standing head of water for 24 hours without leakage.



MST will not adhere to components that are dirty or dust covered or to surfaces coated with oils or other release agents.
MST will expand to follow and fill irregular substrates within reason. Sharp corners and acute angles may need to be filled with additional filler pieces of MST in order to ensure a proper seal.
• Substrate must be capable of resisting, without deflection, approximately 1.5 to 2.5 lb/in2 (10 to 17 kPa) back pressure from the MST.

Standard and Custom Sizes
EMSEAL products are available internationally. The product range is continually being developed. EMSEAL reserves the right to modify or withdraw any product without prior notice.

Installation Guidelines

1. Storage and Surface Preparation
Tape should be stored in a warm dry interior location. Ideal application temperature is approx. 75F (24C). Expansion will be faster at higher temperatures and slower at lower temperatures.
Tip: For faster expansion in cold conditions keep the material warm before use and, if desired, apply heat from a hair dryer to installed material to accelerate expansion. Joint faces should be dry and cleaned of dirt, oils, grease, etc. There should exist sufficient depth to receive full width of the sealant.
IMPORTANT: Reels must be stored FLAT and kept compact. Should material expand in package it can still be used. Unroll material, allow it to expand, then recompress it between surfaces to be sealed.

2. Opening Reels

Only open materials that will be immediately used. Remove shrink wrap.

Cut in front of colored marking tape and pull back release liner to expose mounting adhesive.

3. Square Off Ends

Start and finish ends must be cut square. For easier cutting spray knife or scissors with mist of water.

4. Peel Off Liner

Remove release liner to expose adhesive face of tape.

5. Adhere to Surfaces

Press adhesive face to one surface. Align other surface with tape. Secure surfaces together. Tip: If needed, cut and fit small filler pieces of tape to fill panel corrugation or voids.

6. Joining Lengths

Work in one direction towards the previously installed length or end of joint. Do not stretch material.
Leave the end to be joined to the previous length sticking proud of the joint. Push the joining faces together. Push hard on the foam length to compress joins firmly together. Ensure there are no voids at joins.
Once the full length is installed, push the protruding
join into the joint.

Available in many sizes.

If this tape size does not return the results you desire in your specific application, ask your vendor for other size options.



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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