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When building elements move, the sealant must move with them. Facade panels expand, windows shift with thermal cycling, and precast joints flex under load. If your sealant can’t handle continuous, significant movement, you face premature failure and water ingress. Hi-Flex Construction provides the robust ±50% movement capability and lasting UV resistance these dynamic joints demand, maintaining integrity where standard sealants fall short.
Hi-Flex Construction is engineered to meet the extreme demands of dynamic building elements. This high-performance MS Polymer sealant specialises in sealing critical building joints like window perimeters, facade panels, and expansion joints that experience constant movement. Formulated with a low modulus and exceptional elongation, it ensures the joint seal remains intact, waterproof, and durable against environmental stresses and building movement for the long term. It’s the specification fulfilment where standard sealants are simply not enough.
Understanding these performance metrics helps specify the right product for high-movement applications:
Applying Hi-Flex Construction is straightforward. Ensure surfaces are clean, dry, and free of contaminants. Primerless adhesion is often achievable on non-porous substrates. For critical, high-performance, or highly stressed joints, prepare porous surfaces with Everflex Supaprime Sealant Primer. For non-porous surfaces, use Adheseal 50A Surface Prep. Apply the sealant at temperatures between 5°C and 40°C, filling the joint completely to avoid air entrapment.
Tool the sealant immediately after application, within approximately 10 minutes, to achieve a smooth finish. The sealant forms a skin quickly and cures at a rate of approximately 3mm per 24 hours under standard conditions (25°C and 50% humidity). Use a compatible backer rod to control sealant depth and prevent three-sided adhesion, crucial for optimal movement performance. Clean wet tools and spills with Xylene. For skin, use Adheseal Hand Wipes.
Hi-Flex Construction stands out within the MS Polymer range due to its specialist focus on extreme movement and high-performance building joints. While it is a low modulus sealant, its engineering priorities differ significantly from other products.
For applications primarily involving waterproofing membranes, bond breakers, or fillet joints, Adheseal Hi-Flex 50 Low-Modulus Waterproofing Membrane is a better fit. If your project requires an anti-pick sealant for structural bonding or XPS panels, redirect to Adheseal Hi-Flex 60 Anti-Pick Primer. For general, everyday low modulus MS Polymer sealing tasks where extreme movement is not the primary driver, Adheseal Hi-Flex LM Low-Modulus Hybrid Polymer Sealant provides an economical and effective choice. Hi-Flex Construction is specifically for the critical joints demanding proven ±50% movement and architectural non-staining performance.
No. Hi-Flex Construction + is not suitable for continuous water immersion or internal swimming pool zones, and exposure to high chlorine levels must be avoided entirely.
The sealant cures at a rate of 2mm to 3mm per 24 hours at 25°C and 50% relative humidity. Actual skinning begins within 10 to 15 minutes of application.
It achieves strong primeless adhesion on most surfaces. However, critical configurations like multi-story buildings, high-stress joints, or extreme weather exposure require matching porous or non-porous primers.
Yes, it is paintable with acrylic, oil, and rubber-based paints. Always run a preliminary test, as non-flexible paints may crack if the underlying joint moves significantly.
External joints must maintain a minimum width and depth of 12mm. Aim for a 2:1 width-to-depth ratio, and use a backing rod for depths exceeding 10mm.
| Application | Key benefit | Primary trades |
|---|---|---|
| Perimeter window sealing | Accommodates large differential thermal movement between metals and masonry without tearing. | Window Installers, Glaziers, Carpenters |
| Precast panel joints | Provides Class 50 movement capacity (+/-50%) to prevent cracking in tilt-up concrete walls. | Commercial Caulkers, Bricklayers, Concreters |
| External wall cladding | Resists extreme UV radiation and heavy weathering without staining porous facade panels. | Cladding Specialists, Facade Engineers |
| Aluminium fabrication | Delivers high-strength primeless adhesion on non-porous powder-coated metals. | Sheet Metal Workers, Aluminium Fabricators |
| Acoustic tile installation | Maintains a low-VOC, low-odour elastomeric bond that complies with Green Star indoor criteria. | Ceiling Fixers, Acoustic Contractors |
| Marine & vehicle joints | Cures without gassing in high humidity, forming a dustproof and permanently flexible seam. | Shipbuilders, Automotive Manufacturers |
First aiders and installers should wear protective work gloves and safety glasses with integrated side shields to avoid intermittent contact during high-volume application.
Apply only in well-ventilated construction zones or open external environments. If symptoms or respiratory irritation persist from vapor exposure, immediately relocate personnel to fresh air.
Store securely in original un-opened packaging within a cool, dry warehouse environment maintained between 10°C and 35°C. Product carries a definitive shelf life of 12 months from manufacture.
Surfaces must be structurally sound, dry, clean, and free of dust, oils, grease, curing compounds, or moisture transmission before application.
Surface prep: Ensure concrete has cured for at least 28 days to prevent delamination. Remove all friable material, dust, and form release agents.
Primer: Optional. For critical, highly stressed, or multi-story external applications, prime the surface with Everflex Supaprime using a brush, then wait 30 to 120 minutes before sealing.
Surface prep: Slightly roughen the metallic surface using a fine abrasive pad. Perform a standard two-wipe clean process using a clean cloth moistened with Xylene.
Primer: Optional. For high-performance installations, pre-treat non-porous metal surfaces with Adheseal 50A surface prep. Allow 30 to 120 minutes of flash time prior to sealant application.
Surface prep: Verify chemical compatibility with a spot test. Clean thoroughly using clean, frequently changed cloths to prevent transferring surface contamination.
Primer: Optional. Pre-treatment with Adheseal 50A surface prep is recommended on non-porous coatings to ensure maximum long-term bond durability under extreme weather.
Surface prep: Wipe away surface contaminants completely. Due to wide structural variations in plastic compounds, an adhesion test must be executed before general site application.
Primer: Required. Apply Adheseal 50A surface prep to clean PVC profiles, ensuring a minimum drying window of 30 minutes and a maximum window of 2 hours before gunning paste.
| Property | Value |
|---|---|
| Material Type | Hybrid MS Polymer |
| Curing System | 2–3 mm per 24 hours at 23°C to 25°C, 50% RH |
| Colour | White (RAL 9003), Grey (RAL 7047), Black (RAL 9011) |
| Density | 1.48 ± 0.05 g/cm³ |
| Shear Strength | 0.65 MPa |
| Elongation | >600% |
| Movement Capability | ±50% |
| Shore Hardness | 29 (after 14 days) |
| Modulus | 0.41 MPa |
| Pot Life | ≈25 minutes at 23°C and 50% RH |
| Skin Time | ≈10–15 minutes at 23°C to 25°C and 50% RH |
| Application Temperature | +5°C to +40°C |
| Service Temperature | -40°C to +100°C |
| UV Resistance | 500 h – Good (meets industrial standard) |
| Chemical Resistance | Excellent to water & detergents, Moderate to diluted acids/alkalis, Petrol & oil short periods |
| Coverage Rate | 6 mm × 6 mm: 16.7 m, 10 mm × 10 mm: 6.0 m, 12 mm × 12 mm: 4.2 m, 20 mm × 10 mm: 3.0 m, Triangular 10 mm × 10 mm: 12 m |
| Substrate Compatibility | Not for long-term immersion, Pools, Aquariums, Structural glazing, Mirrors, Avoid copper/brass discolouration, Not for bituminous or EPDM, Avoid confined cure and MVTR |
| Paintability | Paintable (test first, non-flexible paints may crack) |
| VOC Content | <4% |
| Standards | Class 50 |
| Packaging | 600 mL sausage, Carton of 20 |
| Shelf Life | 12 months (original packaging) |
| Storage Conditions | Cool, Dry, 10°C to 35°C |
Here are some common examples on where Adheseal Hi-Flex Construction Plus MS Polymer Sealant used by our customers.
