DSF-Compliant Watertight Joint System

Water-resistant, joint-face-adhered, precompressed, primary seal for retrofit and new structural expansion joints and construction joints where contact with potable water is expected to occur. Compliant to NSF/ANSI Standard 61 for contact with potable drinking water and with FDA Regulation CFR 177.2600 for indirect contact with food.

The DSF SYSTEM features EMSEAL’s patent-pending microsphere-modified acrylic adhesive infused into the cellular foam base material.

Standard sizes from 12mm to 50mm for applications under constant submersion. For larger sizes up to 100mm, contact ALLCO to determine conditions and application.

Movement Capability
±25% (Total 50%) of nominal material size.

Uses

Manufactured to resist and not contaminate conditions found when expansion systems contact water and other clean liquids. Some examples are:

Product Description

Featuring a silicone-bellows sealing surface and backed by an integral, pressure-resisting impregnated foam backing, the DSF System provides a lasting solution to joint sealing applications where constant exposure to non-corrosive liquids is expected. It also provides a seal which will not pose a contamination risk to liquids or solids which may be ingested.

The silicone bellows are compliant to NSF/ANSI Standard 61 for contact with potable drinking water. They are also in compliance with FDA Regulation CFR 177.2600 for indirect contact with food.

The system is comprised of (see Figure 1) precompressed, silicone-and-impregnated-foam hybrid installed into field-applied epoxy adhesive on the joint faces with the silicone bellows locked to the joint faces with a silicone sealant band.

For submerged applications this product has been tested in a hydrostatic-head pressure simulator to continuously resist water pressure of various levels without product deflection or leaking. Consult EMSEAL for the status and for application head pressure which will coincide with your situation.

Figure 1: DSF SYSTEM in Typical Installation (Single-sided)

Features

Watertight
DSF System is installed with the tensionless silicone bellows facing the liquid ensuring that watertightness is achieved.

Non-Invasive Anchoring
There are no hard metal-to-substrate connections with the DSF 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.

Movement Capability
±25% (50% total) of nominal material size.

Versatility
The standard DSF SYSTEM color is off-white. Uniform bellows appearance, chemical resistance, and ability to handle variations in joint size through size-switching are among other system features.

Continuity of Seal
As in all EMSEAL expansion joint systems, continuity of seal through changes in plane and direction is an essential performance differentiator. The DSF SYSTEM utilizes EMSEAL’s exclusive "Universal- 90’s" which are factory-fabricated single-piece 90-degree units.

Double-Sided Straight-Run Option — The DSF SYSTEM is also available with double-sided protection manufactured with the water-resistant bellows on both sides of straight lengths for use in applications where exposure from two sides is possible. (See Figure 2)

Figure 2: DSF SYSTEM in Installation Where Exposure From Both Sides is Possible (Double-sided)

Performance

Capable of movements of ±25% (50% total) of nominal material size.

The DSF SYSTEM will maintain its watertight capabilities and shape under a constant submerged depth (hydrostatic pressure) at various depths. Consult ALLCO for your application.

Standard sizes from 12mm to 50mm for applications under constant submersion. For larger sizes up to 100mm contact ALLCO to determine conditions and application.

Substrates must be solid, parallel, plumb and capable of resisting approximately 2.5 psi backpressure from the foam.

Applicable Standards: The Silicone coating meets or exceeds Compliant to NSF/ANSI Standard 61; NSF Standard 51; FDA Regulation CFR 177.2600; MIL-A-46146; and UL 94 Flame Class, 94 HB.

Composition

The DSF System is produced by coating an impregnated cellular foam with a non-corrosive liquid silicone sealant compliant to NSF/ANSI 61 Standard as well as FDA regulation CFR 177.2600.

The external silicone facing is factory applied to the foam at a width greater than the maximum offered extension and is cured before final compression.

The 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 stress in the silicone material.

The foam provides a resilient backing to the silicone coating, making the system capable of resisting head pressure and reasonable transient point loads.

The DSF System is supplied in 2m shrink-wrapped lengths (sticks). "Universal-90" factory-fabricated corners with a standard length of 150 mm (one leg) and 300 mm (other leg) are also available. DSF 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.

Availability and Price

The DSF SYSTEM is available for shipment internationally subject to shipping restrictions for flammable and hazardous materials. Prices are available from ALLCO AGENCIES LTD. The product range is continually being updated, and accordingly EMSEAL and their agents reserve the right to modify or withdraw any product without prior notice.

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

  DSF System Technical Data