Uses

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

Features

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 polysulfide sealant band at the joint face to foam-and-polysulfide-bellows interface.

Movement Capability +25% and -25% (50% total) of nominal material size. (See "Performance")

CHEMSEAL+5 will maintain its watertight capabilities and shape under a constant submerged depth (hydrostatic pressure) of up to 5 feet.

Standard sizes from 1/2" (12mm) to 2" (50mm). Other sizes available subject to review of application. Consult EMSEAL.

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

Chemical Resistance: The polysulfide sealant is not degraded by contact with many chemicals. (See Chemical Resistance Chart)

Composition

• CHEMSEAL+5 is produced by coating an impregnated cellular foam with a chemical-resistant polysulfide liquid sealant.

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

• Polysulfide 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 polysulfide material.

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

Installation

IMPORTANT: The following instructions are a summary. Refer to "CHEMSEAL Install Data" and job-specific instructions of an EMSEAL technician for complete procedures. FOR PROFESSIONAL USE ONLY. KEEP OUT OF REACH OF CHILDREN.

• Store indoors at room temperature. Expansion is quicker when warm, slower when cold. Substrate temperature must range between 50deg.F (10deg.C) and 110deg.F (43deg.C).

Shelf Life: One year in original unopened packaging stored at temperatures not to exceed 80-deg.F (26deg.C)

• Precautions: Wear chemical-resistant gloves and/or barrier hand cream when handling liquid polysulfide sealant or epoxy. Remove promptly from skin with a commercial hand cleaner before eating or smoking. Avoid inhaling vapors.

• Sequencing: Install factory-fabricated transition and/or termination pieces first. Connect straight run material to in-place terminations and transitions. Cut closing pieces 3/8-inch (10mm) longer than the opening to be joined. Compress material longitudinally to fit.

• Ensure nominal material size matches joint size.

• Mix epoxy and trowel a thin layer onto the joint faces to at least the depth of the CHEMSEAL+5 foam.

• Remove shrink-wrap packaging, hardboard.

• Wipe polysulfide facing using clean lint-free rag made damp with solvent.

• Insert material into joint to determined depth below the substrate surface such that the tops of the bellows are essentially flush with the substrate surface.

• The polysulfide liquid sealant is shipped in 1.5 gallon kits in two components. Thorough blending of the base and activator components is essential for optimum sealant performance. Remove the Activator (part A) from the Base (part B) container. Also be sure to remove the polyethylene sheet or tray from the B container. Before adding Part A, mix Part B with a mixing paddle with a low-speed, heavy-duty electric drill. Then add Part A to Part and mix for 6-minutes, or until the material is completely blended, scraping down the sides of the container and mixing paddle periodically during mixing. DO NOT mix base and activator components from one shipment with components from another. DO NOT divide or split a kit--The full 1.5 gallon kit must be mixed and the mixed sealant drawn up into a bulk gun from which it will be dispensed. The working time on a mixed kit is about 1 hour at 70-deg F. (21-deg C). Some wastage should be expected and extra kits may need to be ordered by the applicator depending on the total quantity, temperature at time of installation and staging of the work.

• Inject a band of liquid polysulfide between mating bellows’ faces.

• Join lengths by pushing polysulfide-coated ends firmly together.

• Before the epoxy or the mixed polysulfide cures, force the tip of the bulk gun cone between the foam and the substrate and inject a polysulfide sealant band. Tool the overflow sealant into a cover bead between the top of the polysulfide bellows and the substrate.

• Tool the polysulfide between joined lengths so that the bellows are not restrained by excess polysulfide.

NOTE: It is critical that any exposed foam ends or any other foam exposed during installation be field coated with the liquid polysulfide sealant supplied. The resilient foam backing is not resistant to chemical exposure.

• Clean Up: Remove polysulfide sealant from equipment before it cures using MEK*, Toluene*, or Xylene*. These solvents are not effective after the polysulfide has cured. Cured material may be removed by cutting it away with sharp tools, sandpapering or softening with chlorinated solvents*.

IMPORTANT Allow liquid polysulfide to attain a complete cure before filling area with liquid (7 days minimum).

Availability and Price