Multi-faced, silicone-coated, precompressed, primary seal in structural, high-movement joints in virtually any substrate.

Movement Capability of +30% and -25% (Total 55%) of nominal material size.
Non-invasive anchoring, continuity of seal, water-tight, aesthetically and practically versatile

Watertight, traffic durable, joint-face-adhered, precompressed, primary seal in structural and non-structural deck joints in parking, stadium, ice rink ice-floor perimeters, stair and elevator perimeters and other applications in concrete or metal-reinforced substrates as well as in positive-side, below-grade foundation and tunnel wall joints. Also a lasting alternative to caulk and backer rod in welded tee connections and other static, and control joints.

Microsphere-modified-acrylic-impregnated foam sealant, factory pre-coated with highway-grade silicone. Watertight, odorless, clean handling, UV stable, non-staining, low temperature flexible, high-temperature stable.

Uses

Ideal for new construction and retrofit of old or failed joint systems in concrete-to-concrete substrates or where demolition and removal of existing embedded metal angles is not feasible or affordable.

Ideal for lasting replacement of tee-to-tee caulk joints in precast-concrete parking decks and stadiums.

Positive-side, below-grade foundation and tunnel wall joints.

Movement Capability of +30% and -25% (Total 55%) of nominal material size.

Product Description

The DSM SYSTEM builds on a track record of over 30 years of sealing horizontal plane joints with impregnated foam sealants and is an evolution of EMSEAL's DSH SYSTEM.

The system is comprised of:
1) Precompressed, silicone-and-impregnated-foam hybrid installed into...
2) field-applied epoxy adhesive on the joint faces; with the silicone bellows locked to the joint faces with...
3) a silicone sealant band.

The DSM SYSTEM features an innovation in sealant technology in the form of a patent-pending acrylic adhesive infused into the cellular foam base material. This new chemistry incorporates a microsphere-modified-acrylic impregnation never before available in a sealant formulation.

The material features sealing performance significantly greater than any acrylic impregnated predecessor. In addition, it is odorless, clean handling, UV stable, non-staining, and features low temperature flexibility not previously available in asphalt, wax, or isobutylene-based predecessors.

The result is extension of the usability of the product to applications where asphalt and wax-based predecessors did not work well under conditions of thermal shock (rapid opening and closing of joints during large temperature swings). These applications include joint-face adhered installations on top decks as well as intermediate decks.

Suitability is further extended to horizontal-plane joint applications in colder geographical regions to which asphalt and wax-based predecessors have not previously been recommended.

Features

Watertight
The tensionless silicone bellows is installed just below the deck surface. This ensures watertightness is achieved at the deck surface.

Non-Invasive Anchoring
There are no hard metal-to-concrete connections in the system. This includes embedded pins, anchors, screws, bolts or tracks, trays or rails. The system is locked to the joint faces by means of the 1) backpressure of the foam; 2) the epoxy adhesive, and 3) the injected silicone sealant band at the joint face to foam and silicone bellows interface.

Continuity of Seal
As in all EMSEAL expansion joint systems, continuity of seal through changes in plane and direction is an essential performance differentiator. Details for watertight, field-fabricated transitions from deck to wall, at curbs, sidewalks, parapets, tees, and crosses are available with the DSM SYSTEM.

Movement Capability
+30% and -25% (Total 55%) of nominal material size.

Aesthetics & Versatility
Standard color is gray (other colors available), uniform bellows appearance, double sealing, fuel resistance, and an enhanced ability to handle variations in joint size are among other system features.

Performance
• Capable, as a dual seal, of movements of +30%, -25% (55% total) of nominal material size.
• Substrates must be parallel, plumb and capable of resisting approx. 2.5 psi backpressure from the foam.
• Standard sizes from 12mm to 150mm. Other sizes available subject to review of application: consult EMSEAL. For sizes greater than 100mm a coverplate should be installed when the joint will experience pedestrian or vehicular traffic.
• Fuel Resistance: Silicone sealant is not degraded by contact with fuel. Some swelling of the material will normally occur, but it will return to its original shape upon evaporation of the fuel.

Composition
• DSM is produced by coating an impregnated cellular foam with highway-grade silicone.
• The expanding foam is cellular polyurethane foam impregnated with a water-based acrylic containing a high performance micro-cellular additive.
• The silicone external facing is factory applied to the foam at a width greater than maximum joint extension and is cured before final compression.
• Silicone application and curing takes place in a factory-controlled environment. In contrast to field applied liquid sealant and backer rod installations, no movement takes place during curing that can cause deformation or stresses in the material.
• When compressed, a bellows is created in the coating. As joint movement occurs the bellows simply folds and unfolds free of tension on the bondline, and virtually free of tensile stresses in the silicone material.
• The foam provides a resilient backing to the silicone coating, making the system capable of resisting reasonable transient point loads.
• DSM SYSTEM is supplied in 2m shrink-wrapped lengths (sticks). It is precompressed to less than the joint size for easy insertion. After removal from the shrink-wrap and hard board restraining packaging, it expands gradually.

100% free of wax or asphalt compounds (Why does this matter?)

 DSM SYSTEM Technical Data