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For joint sealing and structural bonding where vibration, mechanical wear, or water exposure cause standard sealants to fail, Everflex PU240 Polyurethane Adhesive and Sealant provides a high-strength, flexible joint. This high-modulus, moisture-curing polyurethane formulation is pick-resistant and accommodates joint movement up to ±25% in high-traffic pavement joints, metal cladding, and marine assemblies.
Everflex PU240 cures by reacting with atmospheric moisture to form a tough, elastomeric barrier. With a Shore A hardness of 35, it delivers high tear and abrasion resistance, making it suitable for high-exposure environments like car parks, driveways, and marine teak decks. Once fully cured, the compound is stable for continuous submersion in below-waterline marine applications. It can be sanded and painted with acrylic, oil, or rubber-based coatings once cured.
Everflex PU240 bonds to most common construction materials. Acceptable substrates include:
Ensure all substrates are clean, dry, and free of grease, release agents, and curing compounds. Concrete must cure for a minimum of 28 days before application. For impervious substrates, clean the surface using Xylene and the two-wipe process.
Maintain a 2:1 width-to-depth ratio for sealant joints. Internal joints require a minimum width and depth of 5mm; external joints require a minimum width of 12mm. For joints deeper than 10mm, insert an open-cell backer rod (sized 25% larger than the joint width) to control depth and prevent three-sided adhesion.
Yes, once cured, PU-240 is suitable for below waterline applications and re-caulking marine teak floors. Its high bond strength and flexibility handle constant movement and vibration in marine environments.
Do not use PU-240 in totally confined spaces, aquariums, or internal swimming pools with chlorine levels above 5ppm. It is also not for structural glazing, adhering mirrors, or on bituminous, natural rubber, or EPDM surfaces. Test stone for staining before use.
For optimal adhesion in critical applications like multi-story buildings, highly stressed joints, or water immersion, priming is necessary. Use Adheseal 50A for non-porous surfaces and Everflex Supaprime for porous substrates.
PU-240 has a movement capability of +/- 25%. This high permanent flexibility allows joints to accommodate significant expansion and contraction without compromising the seal, maintaining long-term integrity.
| Application | Key benefit | Primary trades |
|---|---|---|
| Perimeter sealing of windows, curtain walls, and masonry joints | High movement capability (+/- 25%) prevents cracking in dynamic joints, maintaining watertight and durable seals against weather. Non-corrosive to common building materials. | Window installers, builders, commercial glaziers |
| Structural bonding of construction materials and lightweight components | Delivers a high-modulus, high-strength flexible bond (Shore A 35, 80% elongation) for materials experiencing constant movement or vibration. Paintable and sandable for finish. | Manufacturers, builders, fabricators |
| Sealing pavement joints, car parks, and driveways | Durable and resilient compound that withstands vehicle traffic, offers chemical resistance to petrol and oil for short periods, and remains flexible across -40ºC to +90ºC service temperatures. | Landscapers, civil contractors, concrete placers |
| Re-caulking marine teak floors and general vehicular/marine manufacturing | Suitable for below waterline applications with high abrasion resistance and permanent elasticity to handle constant movement and vibration in demanding marine environments. | Marine fabricators, boat builders, marine maintenance |
| Sealing metal cladding and bolted lap joints | Non-corrosive to galvanised/zinc-coated steel and aluminium, with excellent adhesion and flexibility to manage differential expansion and contraction of metal panels. | Commercial builders, roofers, metal fabricators |
The foundation of a permanent seal is meticulous preparation. All surfaces must be structurally sound, stable, dry, and completely free of contaminants.
Mechanically remove all dust, laitance, and friable material. Ensure concrete has cured for at least 28 days.
Use a two-wipe process with a clean, lint-free cloth and a suitable solvent (e.g., Xylene) to remove all oils and residue.
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).
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.
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.
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.
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.
Danger: May cause allergy or asthma symptoms or breathing difficulties if inhaled (H334).
Wear gloves (Nitrile Rubber suggested for intermittent contact), apron, and safety glasses. If inhalation risk exists, wear an organic vapour/particulate respirator meeting AS/NZS 1715 and AS/NZS 1716 requirements. Wash hands before eating, drinking, or smoking, and wash contaminated clothing before reuse.
Ensure ventilation is adequate to maintain air concentrations below exposure standards. Use only in well-ventilated areas, or with local exhaust ventilation if generating vapours or dust.
Store in a cool, dry place between 10ºC and 35ºC in original packaging. Shelf life is 12 months. Dispose of in an incinerator for hazardous waste according to local and state regulations.
Proper surface preparation and priming are critical for reliable adhesion and long-term performance.
Includes aluminium, stainless steel, powder-coated metals, PVC, and glazed tiles.
Surface prep: Lightly roughen the surface with a fine abrasive pad. Clean thoroughly using Xylene with a two-wipe process, ensuring cloths are changed frequently to remove all contaminants.
Primer: Optional for many applications, but Adheseal 50A surface prep is recommended for optimal adhesion in critical, high-performance conditions. Apply and allow 30 minutes to 2 hours flash-off before sealant application. Always conduct an adhesion test for metals like copper, brass, and titanium-zinc, and plastics like PVC.
Includes concrete, masonry, brick, and cement-based renders or mortars.
Surface prep: Surfaces must be structurally sound, dry, and free from dust, oils, grease, curing compounds, and any loose material. Concrete must be cured for at least 28 days to prevent delamination. Substrate must be free from surface water and continuous dampness.
Primer: Optional for many applications, but Everflex Supaprime is recommended for optimal adhesion in critical, high-performance conditions. Apply by brush and allow 30 minutes to 2 hours flash-off before sealant application. Avoid excessive application to prevent puddling in the joint base.
| Property | Value |
|---|---|
| Type of Product | Polyurethane Sealant |
| Curing System | Moisture Cure |
| Shore A Hardness | 35 (ISO 868) |
| Working Time | 20 min @23ºC & 65% RH |
| Skinning Time | 30 min @23ºC & 65% RH |
| Cure Time per 24 Hours | 4 mm |
| Application Temperature | 5ºC to 35ºC |
| Service Temperature | -40ºC to +90ºC |
| Chemical Resistance | Excellent to water, detergent solutions, diluted acids & alkalis, petrol and oil for short periods |
| Consistency | Paste |
| Movement Capability | +/- 25% |
| Elongation at Break | 80% (ISO 8339) |
| UV Resistance | Good (paintable) |
| Density | 1.17 g/cm3 |
| VOC | 76 gm/lt (California South Coast Air Quality management rule 1168) |
| Shelf Life | 12 months in original packaging |
| Storage Temperature | 10ºC to 35ºC |
Here are some common examples on where Everflex PU240 Polyurethane Adhesive and Sealant used by our customers.
