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Everflex PU-240: A Technical Overview
Adheseal Eveflex PU-240 is a high-modulus, high-strength moisture-curing polyurethane construction adhesive and sealant, engineered to provide a tenacious, yet permanently flexible structural bond. This single-component formula is designed for professionals who require both power and versatility. Its inherent toughness delivers exceptional pick and abrasion resistance, making it a reliable choice for high-traffic areas and demanding environments. With the ability to accommodate constant movement and vibration, PU-240 maintains its integrity where rigid adhesives fail, ensuring long-term performance in dynamic applications across construction, marine, automotive, and manufacturing sectors.
4mm / 24hr
Achieve a robust, weatherproof seal faster. The rapid cure rate allows for quicker project turnaround and reduces downtime on site.
Core Features & Specifications
- High Modulus, High Strength Formula: Delivers a powerful, structural-grade bond suitable for load-bearing applications in construction and manufacturing.
- Fast Curing Mechanism: Cures at a rate of 4mm per 24 hours, achieving a solid, weatherproof seal quickly to accelerate project timelines.
- Shore A Hardness of 35: Provides a tough, durable, and pick-resistant surface, ideal for high-traffic areas like pavement joints and public amenities.
- Excellent Movement Capability: Accommodates joint movement of +/- 25%, maintaining a waterproof, flexible seal during thermal expansion and vibration.
- Broad Service Temperature Range: Performs reliably in harsh Australian conditions, from -40°C to +90°C once fully cured.
- Paintable & Sandable: Can be finished with acrylic, oil, and rubber-based paints or sanded to a smooth surface for seamless aesthetic integration.
The Everflex PU-240 Advantage
- Engineered for Versatility: One cartridge handles a vast range of applications, from perimeter window sealing and masonry joints to automotive and marine manufacturing, streamlining your inventory and delivering certainty on any job.
- Achieve a Flawless Finish: The non-corrosive, paintable, and sandable formula gives you the control to deliver a professional-grade finish that integrates perfectly with surrounding surfaces.
- Guaranteed Long-Term Performance: With proven durability, excellent UV resistance, and tear resistance, you can build with confidence, reducing costly call-backs and ensuring client satisfaction.
- Work Faster and Smarter: The rapid skin time and cure rate mean you can move on to the next task sooner, increasing job site efficiency and boosting your productivity.
- Environmentally Conscious Choice: The low VOC formulation meets "Green Star" environmental criteria, making it a responsible choice for modern, sustainable construction projects.
Proactive Troubleshooting
Scenario: Application in Totally Confined Spaces
Potential Outcome: Incomplete cure and sealant failure. The product requires atmospheric moisture to react and cure properly; without airflow, it will remain uncured indefinitely.
Adheseal Best Practice: Always ensure adequate airflow to all sealant surfaces. For applications that are fully enclosed or air-tight, consider an alternative chemistry like a two-component epoxy or MS Polymer.
Scenario: Application to Damp or Unprepared Surfaces
Potential Outcome: Poor adhesion, bubbling, or delamination. Moisture vapour transmission from a damp substrate or entrapped air can cause significant bubbling and bond failure.
Adheseal Best Practice: Ensure all substrates are structurally sound, clean, dry, and free from contaminants. For concrete, allow a minimum 28-day cure. On non-porous surfaces, use the two-wipe process with a suitable solvent like Xylene.
Applications in Practice: Trade Scenarios
For Builders & Carpenters (On-Site Applicator): Structural Bonding & Joint Sealing
The Professional's Challenge
Needing a single product that can both structurally bond lightweight components and seal perimeter joints effectively without failing under constant building movement.
The Adheseal Solution: Engineered Certainty in Practice
Use Everflex PU-240's high bond strength for permanently fixing panels, trims, and components. Its +/- 25% movement capability ensures perimeter seals around windows and masonry remain weatherproof and intact through seasonal changes.
Best Practice Note
For a guaranteed bond on non-porous surfaces like powder-coated aluminium or PVC, lightly abrade the surface and clean with Adheseal 50A Surface Prep. Allow 30 minutes to flash off before applying sealant.
For Marine & Automotive Specialists (Remedial Specialist): Sealing in Hostile Environments
The Professional's Challenge
Sealing bolted lap joints, seams, and fittings that are subject to constant vibration, water exposure, and potential fuel or oil contact, where failure is not an option.
The Adheseal Solution: Engineered Certainty in Practice
Everflex PU-240 creates a tough, tear-resistant, and waterproof seal. Once cured, it is suitable for below-waterline applications and offers excellent resistance to intermittent contact with petrol and oils, ensuring a durable, long-lasting repair.
Best Practice Note
When re-caulking teak decks, completely remove all old sealant. To ensure maximum long-term adhesion and prevent bond failure, prime the timber edges with Everflex Supaprime before applying PU-240.
Frequently Asked Questions
How soon can I paint over Everflex PU-240?
It is crucial to wait until the sealant is fully cured before painting. The cure rate is approximately 4mm per 24 hours. Painting before a full cure, especially with non-flexible paints, can lead to cracking as the sealant continues to cure underneath. Always conduct a paint adhesion test on a small area first.
Is PU-240 suitable for swimming pools?
No, Everflex PU-240 is not recommended for internal or submerged swimming pool applications. It should not be exposed to high levels of chlorine (maximum 5ppm). For these critical applications, a dedicated pool-grade sealant must be used to ensure long-term performance and chemical resistance.
Can I use PU-240 on natural stone like marble or granite?
This is not recommended. Polyurethanes can leach plasticisers and potentially cause discolouration or "staining" on porous natural stone. We strongly advise completing a stain test on an offcut before any use. For sensitive stone like marble and granite, our Adheseal S100 neutral cure silicone is the professionally recommended product.
What is the best way to tool the joint for a smooth finish?
For a professional finish, tool the sealant within 5-10 minutes of application before the skin forms. Use a spatula dipped in a suitable tooling agent to press the sealant firmly against the joint sides. This ensures good contact for optimal adhesion and creates a clean, concave surface.
Does the white PU-240 stay bright white outdoors?
Like many traditional polyurethane sealants, the white version may tend to discolour or yellow slightly over time when exposed to prolonged, direct UV radiation. This is an aesthetic change and does not compromise the sealant's high performance or waterproofing capability. For critical colour-stable applications, it can be painted over once fully cured.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Perimeter sealing of windows, curtain walls, and metal cladding. | Provides a durable, weatherproof, and flexible seal that accommodates building movement (+/- 25%). | Builders, Glaziers, Façade Installers |
| Sealing pavement joints, car parks, and driveways. | High Shore A hardness creates a tough, pick, and tear-resistant surface suitable for trafficable areas. | Concreters, Builders, Civil Contractors |
| Marine seam sealing, re-caulking teak decks, and vehicular assembly. | Waterproof for below-waterline use (once cured), with excellent vibration and chemical resistance. | Marine Fitters, Automotive Manufacturers, RV Builders |
| Structural adhesive for lightweight construction components. | Creates a high-strength, flexible structural bond, superior to rigid adhesives in dynamic situations. | Carpenters, Joiners, Cabinet Makers, Installers |
| General building maintenance and repairs. | Single-cartridge convenience with excellent adhesion to a wide range of common building materials. | Maintenance Managers, Remedial Specialists, All Trades |
Applying Everflex PU-240: Professional Protocols
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Surface & Joint Preparation
The foundation of a permanent seal is meticulous preparation. All surfaces must be structurally sound, stable, dry, and completely free of contaminants.
Porous Surfaces (Concrete/Brick)
Mechanically remove all dust, laitance, and friable material. Ensure concrete has cured for at least 28 days.
Non-Porous Surfaces (Metal/PVC)
Use a two-wipe process with a clean, lint-free cloth and a suitable solvent (e.g., Xylene) to remove all oils and residue.
Pro Tip: For clean, sharp joint lines, mask the edges with a high-quality masking tape. Remove the tape within the sealant's skin time. -
Joint Design & Backing
Proper joint design prevents three-sided adhesion, allowing the sealant to move correctly. The sealant depth should be half the joint width (2:1 ratio).
Controlling Depth
Use an open-cell foam backing rod that is 25% larger than the joint width. Push it into the joint to the required depth. If the joint is too shallow for a rod, apply a bond-breaker tape to the base of the joint.
Pro Tip: Take care not to puncture the skin of closed-cell backing rods, as this can cause outgassing and lead to bubbles forming in the uncured sealant. -
Application & Tooling
Apply between 5°C and 40°C. Cut the nozzle to the desired bead size, puncture the cartridge seal, and place it in a professional caulking gun.
For Sealing
Cut nozzle at a 45° angle. Keep the nozzle in contact with both sides and push the sealant ahead of the nozzle to ensure the joint is filled completely, avoiding air entrapment.
For Adhering
Cut nozzle at a 90° angle, then cut a "V" notch. Apply a triangular bead to one surface, then bring the two surfaces together, compressing the bead to a minimum of 2mm.
Timing: Tool the sealant within 5-10 minutes, before the skin forms. Use a moistened spatula for a smooth, professional concave finish.
Limitations & Safety
Product Limitations
Not for use in totally confined spaces; product requires atmospheric moisture to cure.
Not suitable for internal swimming pool applications or exposure to high chlorine levels.
Not recommended for natural stone (marble, granite) due to risk of staining.
Use Adheseal S100 Neutral Cure Silicone
Not suitable for structural glazing applications.
Use Adheseal N-80 or N-60
May discolour sensitive metals like copper and brass. Not for use on lead.
White colour may yellow slightly with prolonged UV exposure. This is aesthetic and does not affect performance. Product is fully paintable.
This product is designed for professional use. Not recommended for DIY/handyman use due to specific safety protocols and application techniques required for a successful outcome.
Safety & Handling Requirements
Personal Protective Equipment
Always wear safety glasses, gloves (Nitrile Rubber recommended for intermittent contact), and suitable work clothing. Wash hands thoroughly after handling.
Ventilation Requirements
Use in a well-ventilated area to maintain air concentrations below exposure standards. If inhalation risk exists (e.g., in confined or poorly ventilated spaces), wear an organic vapour/particulate respirator meeting AS/NZS 1715 & 1716 standards.
Hazard Information
DANGER. Contains isocyanates. May cause allergy or asthma symptoms or breathing difficulties if inhaled. May cause skin sensitization.
Emergency First Aid
Eyes:
Rinse opened eye for several minutes under running water. Consult a doctor.
Skin:
Immediately wash with water and soap and rinse thoroughly. If irritation persists, seek medical advice.
Inhaled:
Remove person to fresh air and keep comfortable. If experiencing respiratory symptoms, call a POISON CENTRE (13 11 26) or doctor.
Swallowed:
DO NOT induce vomiting. Seek immediate medical advice.
For detailed information, refer to the Safety Data Sheet (SDS).
Adhesion & Preparation Guide
Concrete, Masonry & Brick
Surface Preparation
Ensure surface is sound, clean, dry, and free of laitance or loose material. New concrete must be allowed to cure for at least 28 days. Remove all curing compounds or form release agents.
Primer Requirements
Primer recommended for optimal adhesion
For optimal, long-term adhesion on porous surfaces, especially in high-stress or water-immersed applications, prime the surface by brush.
Everflex SupaprimeAluminium & Powder Coat
Surface Preparation
Ensure surface is clean, dry, and free from oils or grease. Perform a two-wipe process with a clean, lint-free cloth and a suitable solvent like Xylene. Lightly abrading the surface with a fine pad can improve mechanical key.
Primer Requirements
Primer required for critical applications
For critical applications (high-movement, multi-story), pre-treat the cleaned surface. Allow primer to flash off for at least 30 mins (max 2 hours) before applying sealant.
Adheseal 50A Surface PrepTimber
Surface Preparation
Timber must be clean, dry, and free from dust and oils. Oily timbers may need to be wiped with a solvent. Ensure moisture content is within acceptable limits for the timber type.
Primer Requirements
Primer recommended for optimal adhesion
To prevent moisture absorption affecting the cure and to maximise the bond strength, especially for marine applications like teak decks, priming is essential.
Everflex SupaprimePVC & Plastics
Surface Preparation
Clean surface thoroughly to remove any plasticisers or surface coatings using a two-wipe process with a recommended solvent. An adhesion test is always recommended on plastics due to wide variations in composition.
Primer Requirements
Primer recommended for optimal adhesion
For rigid PVC, priming with a surface preparer after cleaning will promote a stronger, more reliable bond. Test adhesion prior to full-scale application.
Adheseal 50A Surface Prep
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