Expansion Joints and Pre-Compressed Sealants

Silicone-coated, pre-compressed, primary seal in high-movement, above-grade vertical-plane wall joints in virtually any substrate.

Tech Data

Install Data


Guide Spec





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Seismic expansion joint seal--SEISMIC COLORSEAL by EMSEAL

SEIMIC COLORSEAL make watertight transition from THERMAFLEX

• Primary seal
• Watertight
• Airtight
Sound attenuating
ABAA Compliant
Resists hurricane force wind & water
• Tensionless silicone bellows
• Rapid installation--new or retrofit
Non-invasive anchoring
Aesthetically and practically versatile
• Easily handles changes in plane and direction
• Easily handles curved expansion joints

• Curtainwall
• Masonry
• Precast
• Metal Panel
• Natural Stone
• EIFS, etc.

Standard Sizes
1/2" to 8" (12mm - 200mm)

Note: Note: Sizes under 1 1/2" (40mm) are manufactured with a single bellows and are supplied as 10' lengths on reels. Larger sizes incorporate multiple bellows and are supplied as 6' long sticks.

Movement Capability
• Total 100% (+50% and -50%) of nominal supplied size.

26 Standard COLORS
Custom Colors



Product Description

SEISMIC COLORSEAL is ideally suited for ensuring watertightness in vertical-plane structural, seismic, and abutment joints in walls of precast concrete, brick, curtain-wall, stone, etc.

SEISMIC COLORSEAL is the latest in an evolution of pre-compressed hybrid sealant technology.  Developed by EMSEAL in the early 1980's, pre-compressed hybrid sealants combine the best of liquid and preformed sealant features while eliminating the shortcomings of each.  SEISMIC COLORSEAL has an unmatched  30+ year track record of  performance.

Evolved from EMSEAL's COLORSEAL, SEISMIC COLORSEAL combines a factory-applied and cured silicone bellows with an impregnated expanding foam backing.  In contrast to COLORSEAL, the backing of SEISMIC COLORSEAL contains less foam, thereby freeing up volume for greater movement without stressing its components. The inherent secondary seal in the foam backing (as in the original COLORSEAL) is traded for the doubling of movement capacity and the silicone bellows does the waterproofing and acts as the weathering surface.

Watertight, odorless, clean handling, UV stable, non-staining, low temperature flexible, high-temperature stable.

SEISMIC COLORSEAL features EMSEAL’s unique microsphere-modified acrylic impregnation infused into a cellular foam base material and is coated with a high-grade silicone coating.

SEISMIC COLORSEAL-DS (Double sided) for shallow-substrate applications.

HORIZONTAL COLORSEAL for non-pedestrian-trafficked, seismic and structural joints in decks, roofs, stair-tower perimeters etc, is SEISMIC COLORSEAL shipped and installed into EMSEAL-supplied epoxy.


Features Explained

Why silicone for the bellows?  Polyurethane sealant options have been proved to suffer dramatic modulus and other physical properties changes at low temperature and over time.  The silicone used on SEISMIC COLORSEAL remains pliant, UV stable and watertight over time and temperature gradient.

Tensionless--The bellows holds the key to SEISMIC COLORSEAL's unique performance.  Backpressure from the stored strain energy of the pre-compressed foam secures the system to the substrate and ensures that the silicone bellows are never under tension from the effects of joint movement.

Cheap alternatives comprised of a pre-cured block of silicone over an un-impregnated foam backing must still be caulked to the substrate with large applications of sealant.  This flanking sealant still suffers the same shortcoming of conventionally installed liquid sealant, namely adhesion in tension during joint opening.

Pre-compressed--Unlike imitations that use closed-cell foam backings that must be forced into compression in the field, SEISMIC COLORSEAL is supplied pre-compressed to smaller than the joint size.  This means that neither the bellows nor the corner bead, nor the foam backing are in tension either during the full extent of movement capability nor as a result of compression set typical in closed-cell foams.

Non-invasive anchoring--means you are not drilling and screwing into sensitive substrates. This eliminates the risk of spalls and enables installation into inside corners that are impossible to seal with screw-anchored strip-seals.

R-value--An R-value of approximately 2.15 per inch of depth imparts thermal insulation at structural joint-gaps where thermal loss through strip-seals is often significant.  R-value is higher when the joint gap is wider as the foam becomes less dense.

Sound Attenuation is also a feature of SEISMIC COLORSEAL. With a 2 1/2" standard depth product installed in one side of a STC 56 wall, SEISMIC COLORSEAL had a STC 52 rating and in an OITC 38 wall it had a 38 OITC rating. When installed from both sides of a STC 68 wall it received the maximum of STC 68 equaling the sound suppression of the wall and in an OITC 52 wall it received a OITC 51 rating.

Performance Limitations
• Substrates must be parallel, plumb and capable of resisting approx. 2.5 psi backpressure from the foam.

Transitions and Terminations:

Universal 90's

(US Patent 9,200,437
Patent Pending)

Custom 90's 
Patent Pending)

U-90's are factory-made transition pieces that ensure continuity-of-seal where expansion joints change plane or direction.

SEISMIC COLORSEAL is manufactured in straight-run sticks which can be joined in the field to EMSEAL’s patented and patent-pending "Universal-90" transitions.

These factory-fabricated single-piece 90-degree units have a 12-inch long leg and a 6-inch vertical piece on each side of the elbow. Universal-90 transition are symmetrically coated on both faces allowing them to be installed as an inside corner or as an outside corner.

In addition to guaranteeing watertightness, EMSEAL’s "Universal-90's" allow for much faster and secure installation by eliminating field cutting or notching and bending, at angles.

Custom-90's (patent pending), coated on just the weather-facing faces, are also available when field conditions and measurements are known up front.

Consult EMSEAL.

(More on Universal-90's


Universal-90 Upturn Transition

Universal-90 Flipped-Over as Downturn Transition

SEISMIC COLORSEAL (sticks that are 1 1/2" or wider) has
a mounting adhesive on one face.  After removal from its packaging, the material is inserted into the joint and adhered to one side. Smaller widths, supplied on reels, do not need mounting adhesive and are inserted into the joint gap as-is. It then expands to fill the joint. The combination of the active backpressure and the pressure-sensitive nature of the acrylic impregnation ensures the attachment of the foam to the substrates.

The injection and tooling of a corner bead of silicone between the cured bellows and substrate completes the installation.

Availability and Price
SEISMIC COLORSEAL is available for shipment internationally.
Prices are available from local representatives and/or directly from the manufacturer.
The product range is continually being updated, and accordingly EMSEAL® reserves the right to modify or withdraw any
   product without prior notice.

EMSEAL JOINT SYSTEMS LTD. 25 Bridle Lane, Westborough, MA 01581
EMSEAL LLC. 120 Carrier Drive, Toronto, ON M9W 5R1



1-800-526-8365 -- 508-836-0280 --  techinfo@emseal.com -- Fax: 508-836-0281

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