DSM SYSTEM and DSM-DS SYSTEM

• DSM SYSTEM Tech Data
• DSM SYSTEM Install
• DSM SYSTEM Install (.htm)
• DSM SYSTEM GuideSpec (.htm)
• DSM Guide Specifications (.doc)
• DSM CAD (dwg/pdf/jpg)
• Universal-90's Overview (.htm)
• Request a DSM SYSTEM sample
• Maintenance & Snow Removal

If you like DSM SYSTEM and want a built in 2-HR fire rating, consider EMSHIELD DFR2:

Watertight, Traffic Durable, high movement AND 2-HOUR FIRE-RATED. One install does it all.

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

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 (see Figure 1).

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 (see "Performance").

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 1/2" (12mm) to 6" (150mm). Other sizes available subject to review of application: consult EMSEAL. For sizes greater than 4" 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 6.56 LF (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 is manufactured in straight-run sticks which can be joined in the field to EMSEAL’s patent-pending "Universal-90" transitions.

Universal-90 Upturn Transition

Universal-90 Flipped-Over as Downturn Transition

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. The Universal-90 transition pieces are symmetrically coated on both faces.  This allows 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.