Chemical-resistant, joint-face-adhered, precompressed, primary seal for retrofit and new structural expansion joints and construction joints where contact with chemicals and chemical dilutions is expected to occur.
CHEMSEAL+5 is the first in an ongoing line of CHEMSEAL models being released by EMSEAL. Tested in a hydrostatic-head pressure simulator to continuously resist water pressure of various levels without product deflection or leaking, additional versions are expected to be made available shortly. Consult ALLCO for status and for applications involving head pressures greater than 1.5m.
CHEMSEAL+5 builds on a track record of over 30 years of sealing structural expansion joints with impregnated foam sealants and is an evolution of EMSEAL's DSM SYSTEM.
Microsphere-modified-acrylic-impregnated foam sealant, factory pre-coated with chemical resistant polysulphide sealant. Watertight, clean handling, UV stable, non-staining, low temperature flexible, high-temperature stable.
The polysulphide coating is SynthacalkTM GC2+ and is resistant to the effects of sunlight, rain, snow, ozone, aging, shrinkage, and daily and seasonal cycling changes caused by temperature fluctuation.
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 the harsh conditions found when expansion systems contact non-purified water or liquid-suspended chemicals. Some examples are:
| Waste Water Tanks | Chlorinated Water |
| Spill Containment | Fountains |
| Industrial Testing Tanks | Pools |
| Cooling Towers | Water Parks & Water Features |
Product Description
Featuring a polysulphide-bellows sealing surface and backed by an integral, pressure-resisting impregnated foam backing, CHEMSEAL+5 provides a lasting solution to joint sealing applications involving chemicals or chemical dilutions.
The system is comprised of precompressed, polysulphide-and-impregnated-foam hybrid installed into field-applied epoxy adhesive on the joint faces with the polysulphide bellows locked to the joint faces with a field-applied polysulphide sealant band.
CHEMSEAL+5 features EMSEAL’s patent-pending microsphere-modified acrylic impregnation infused into the cellular foam base material.
Features
Chemical Resistant
See Chemical Resistance Chart.
Watertight
CHEMSEAL+5 is installed with the tensionless polysulphide bellows facing the liquid ensuring that watertightness is achieved.
Non-Invasive Anchoring
There are no hard metal-to-substrate connections with CHEMSEAL+5. 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 polysulphide sealant band at the joint face to foam-and-polysulfide-bellows interface.
Movement Capability
±25% (50% total) of nominal material size.
Versatility
The standard CHEMSEAL+5 color is grey. 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. CHEMSEAL+5 is manufactured in straight-run sticks which are joined in the field with EMSEAL’s exclusive "Universal- 90’s" which are factory-fabricated single-piece 90-degree units. In addition to guaranteeing watertightness, EMSEAL’s "Universal-90’s" allow for much faster and secure installation by eliminating field cutting at angles. And because they are coated on both sides they can easily be installed at inside and outside corners as needed
Double-Sided Straight-Run Option
CHEMSEAL+5 is also available with double-sided protection manufactured with the chemical-resistant bellows on both sides of straight lengths for use in applications where contamination from two sides is possible.
Performance
Capable of movements of ±25% (50% total) of nominal material size.
CHEMSEAL+5 will maintain its watertight capabilities and shape under a constant submerged depth (hydrostatic pressure) of up to 1.5m.
Standard sizes from 12mm to 50mm. Other sizes available subject to review of application. Consult ALLCO.
Substrates must be solid, parallel, plumb and capable of resisting approximately 2.5 psi backpressure from the foam.
Chemical Resistance
The polysulphide sealant is not degraded by contact with many chemicals. (See Chemical Resistance Chart)
Applicable Standards
The polysulphide coating meets or exceeds all aspects of Federal Specification TT-S-00227E, Type II, Class A in all respects except Section 3.5.7, “Stain and Colour Change”, ASTM C920, Type M, Grade NS, Class 25, Use NT, M, G, A with the exception of ASTM C510 “Stain and Colour Change”. Also exceeds the test requirements of ASTM C1247 for sealants exposed to continuous immersion in liquids and NSF Standards 61, Section 6 for Joining and Sealing Materials.
Composition
• CHEMSEAL+5 is produced by coating an impregnated cellular foam with a chemical-resistant polysulphide liquid sealant.
• The polysulphide external facing is factory-applied to the foam at a width greater than the maximum offered extension and is cured before final compression.
• Polysulphide 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 bond line, and virtually free of tensile stresses in the polysulphide material.
• The foam provides a resilient backing to the polysulphide coating, making the system capable of resisting head pressure and reasonable transient point loads.
• CHEMSEAL+5 is supplied in 2m shrink-wrapped lengths (sticks). "Universal-90" factory-fabricated corners with a standard length of 150mm (one leg) and 300mm (other leg) are also available and are required for executing transitions in plane. CHEMSEAL+5 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
CHEMSEAL+5 is available for shipment internationally subject to shipping restrictions for flammable and hazardous materials. Prices are available from ALLCO. The product range is continually being updated, and accordingly EMSEAL reserves the right to modify or withdraw any product without prior notice.
100% free of wax or asphalt compounds (Why does this matter?)
