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DSM SYSTEM
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• Watertight, tensionless silicone bellows
• Traffic durable
• Easy installation, non-invasive anchoring
• Staged installation preserves traffic flow
• Joint-face adhered
• 100% free of wax or asphalt compounds
(Why does
this matter?)
Uses
• Ideal for new construction and retrofit of old or failed
expansion 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.
• decks • runways •
stadiums •
parking decks • car
parks • airport aprons • arenas
•
roadways • sidewalks • mall bridge connectors •
ice-floors • stair
towers
• perimeter joints • movement joints
•
positive-side, below-grade foundation and tunnel wall joints.
Standard
Sizes:
1/2" (12mm) to
4" (100mm)
(above 4" see
SJS SYSTEM or consult EMSEAL)
Movement Capability:
up to 55% Total (+30% and -25% of nominal supplied size.) |
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Product Description
The DSM SYSTEM builds on a track record of over 30 years of sealing
horizontal plane expansion 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.
DSM features sealing performance significantly greater than any
impregnated precompressed 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 or 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.
The DSM SYSTEM has an
extensive track record
of service throughout the world. It has been widely adopted as the
replacement for virtually all applications where older, inflated, "jeene"-type
systems were once favored. In contrast to the inflated seals, the DSM
SYSTEM remains in compression over its life. As a result it is not
subject to failure due to excessive tension on the bondline.
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DSM SYSTEM in
Typical Concrete Substrates:
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DSM SYSTEM in Existing
metal angle substrates:
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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 4" (100mm). 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. DSM-DS is also available which is built
with the silicone coating on the top and bottom surface.
• 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.
Click here to see
who's using DSM? |
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Patent Pending
UNIVERSAL 90's
(Expanded Universal-90's information)
Factory-Fabricated Transitions—
as in all EMSEAL expansion joint systems, continuity of seal through
changes in plane and direction is an essential performance
differentiator.
DSM is manufactured in straight-run sticks which can be joined
in the field to EMSEAL’s 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.
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.
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Universal-90
Upturn Transition |
Universal-90
Flipped-Over as Downturn Transition |
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***Note: With its
introduction in 2006 the
DSM SYSTEM supersedes its predecessors, 20H SYSTEM and DSH SYSTEM, in
most applications.
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 earlier technologies. The DSM SYSTEM features greater movement
capability, dual sealing, a fuel resistant silicone bellows coating, better low temperature flexibility, and improved high
temperature stability. It achieves these improvements through EMSEAL’s new
microsphere-modified-acrylic impregnation technology and is free of any asphalt
compounds. Additionally, the DSM SYSTEM is totally
free of wax or wax
compounds. Consequently the suitability of the DSM SYSTEM is extended
geographically as well as to applications such as in metal-angles, and
top-decks previously not recommended for joint-face-adhered systems. *** |
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