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When your installations demand more than just a seal—when they need to withstand constant vibration, dynamic movement, and direct exposure to the elements—Everflex PU-240 delivers. It's engineered to keep critical structural bonds and flexible joints intact, preventing the costly failures that ordinary sealants can't handle in challenging environments like marine, vehicular, or heavy-duty construction. You get a tough, flexible bond that lasts.
Everflex PU-240 was formulated as a high-modulus, high-strength, moisture-curing polyurethane sealant and adhesive. Its purpose is to provide robust, flexible structural bonding for components and joints in dynamic environments. It addresses the need for a durable, sandable, and paintable solution in a convenient cartridge, making it ideal for small-scale maintenance and installation work where structural integrity and flexibility under movement are non-negotiable. Its exceptional mechanical and abrasion resistance means it stands up to traffic and impacts, preventing premature wear.
Prepare surfaces thoroughly: they must be dry, clean, and free from contaminants. For impervious substrates, use a two-wipe process with Adheseal Xylene Solvent. Slightly roughen non-porous surfaces before pre-treating with Adheseal 50A Surface Prep. For porous substrates like concrete or masonry, prime with Everflex Supaprime Sealant Primer. Always allow primers to flash off as instructed, typically 30 minutes to 2 hours before sealant application.
For sealing, cut the nozzle at a 45º angle and push the bead ahead of the nozzle into the joint, ensuring full contact. For adhesive applications, cut the nozzle to create a triangular bead and apply flat to the surface before compressing components together. Tool off with a moistened spatula within approximately 5 minutes before skinning occurs. Remove masking tape while the sealant is still wet to achieve clean lines. Clean wet spills and tools with Adheseal Xylene Solvent. For skin cleanup, use Adheseal Hand Wipes.
Everflex PU-240 typically serves as the final sealing or bonding layer in a system designed for high performance and durability. After appropriate surface preparation and priming (e.g., with Everflex Supaprime Sealant Primer for porous substrates or Adheseal 50A Surface Prep for non-porous), it is applied into joints or between components. For sealant joints, it works in conjunction with compatible backer rod to control depth and prevent three-sided adhesion, ensuring optimal performance and movement capability. Its placement as the exposed layer means its UV stability and mechanical resistance are critical for system longevity.
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 used by our customers.
