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For high-demand public facilities, heavy transport manufacturing, and civil joint sealing where standard sealants risk tearing, peeling, or being picked apart, Adheseal PU50 Polyurethane Sealant delivers a high-modulus, fast-curing elastomeric bond. Its Shore A hardness of 45 makes it resilient enough to serve as an anti-pick sealant in schools and prisons, while its rapid moisture-cure mechanism accommodates constant vibration and joint movement.
Adheseal PU50 functions as both a heavy-duty joint sealant and a structural adhesive. By curing through reaction with atmospheric moisture, it forms a tough, abrasion-resistant polyurethane barrier that tolerates up to ±25% joint movement. The cured compound is tear-resistant and suitable for below-waterline applications once fully cured. It provides non-corrosive adhesion to metals, including galvanised steel and concrete, and resists mould and mildew in hot, humid service conditions. It can be painted with acrylic, oil, or rubber-based systems once cured, though non-flexible paints may crack under joint movement.
Adheseal PU50 is suitable for external and internal applications across these substrates and assemblies:
Apply when ambient and substrate temperatures are between 5°C and 35°C.
Substrate Preparation: Surfaces must be stable, dry, clean, and free from grease, curing compounds, or standing moisture. Concrete must be cured for at least 28 days to prevent delamination and mould growth. Clean impervious substrates using a two-wipe process with clean cloths and Acetone or 100% White Spirits.
Priming: While adhesion is normally achieved without priming, critical or high-stress joints require specific pre-treatment:
Joint Geometry: Design joints to a 2:1 width-to-depth ratio. Internal joints must be a minimum of 5mm wide and deep. External joints must be a minimum of 10mm wide. The maximum allowable joint width is 30mm, with a maximum depth of 15mm. Use a closed-cell backing rod 25% larger than the joint width for joints deeper than 10mm. Ensure the sealant only bonds to two sides; use polyethylene release tape on flat joints to prevent three-sided adhesion.
Tooling and Clean Up: Tool joints with a moistened spatula within 15 minutes of application, before the skin forms. Clean wet tools and excess sealant immediately using Xylene. Cured material must be removed mechanically.
Yes, Adheseal PU50FC's Shore A hardness of 45 after 14 days makes it suitable as an anti-pick sealant. It is designed for use in public buildings, schools, and prisons where resistance to picking and vandalism is required.
Yes, once fully cured, Adheseal PU50FC is suitable for below-waterline applications. It also accommodates constant movement and vibration, which is important for marine manufacturing and boat decks.
Do not use PU50FC in totally confined spaces as it requires atmospheric humidity to cure. Ensure adequate ventilation or air access for proper curing of the sealant.
Adheseal PU50FC adheres well to most metals, including stainless steel, aluminium, and galvanised surfaces. However, it is not suitable for lead or copper, and may discolour copper and brass. Always perform an adhesion test.
| Application | Key benefit | Primary trades |
|---|---|---|
| Anti-pick sealing in public buildings | High modulus (Shore A 45) and abrasion resistance prevents picking and vandalism. | Builders, facility managers, security contractors |
| Structural bonding of construction elements | Flexible, high-strength bond accommodates movement and vibration, ensuring long-term integrity. | Structural engineers, builders, fabricators |
| Bonding XPS Foam Core Reinforced sandwich panels | Reliable, flexible adhesion for fabricating panels and facades. | Panel manufacturers, facade installers |
| Vehicular and marine manufacturing | Withstands constant movement, vibration, and is suitable for below-waterline applications once cured. | Boat builders, truck body manufacturers, automotive repair |
| Pavement joints, car parks, driveways | Maintains a waterproof flexible joint with good tear resistance and UV resistance. | Civil contractors, landscapers, concrete placers |
| Bonding solar panels to motor home, caravan & boat roofs | Strong, flexible bond that tolerates movement, vibration, and external conditions. | RV manufacturers, marine fitters, solar installers |
A high-strength bond is only as good as the surface it's applied to. Meticulous preparation is non-negotiable for performance.
All surfaces must be structurally sound, dry, and completely free of contaminants. Follow the substrate-specific priming guide for all applications to ensure a permanent, structural-grade bond.
For sealant applications, install an open-cell foam backing rod to control sealant depth to the optimal 2:1 width-to-depth ratio and prevent three-sided adhesion, which restricts flexibility.
PU-50FC is a high-viscosity product. Use a high-quality application gun and apply steady pressure for a consistent bead.
Cut the nozzle at a 45° angle. Push a solid bead of sealant ahead of the nozzle, forcing it into the joint and ensuring full contact with both primed surfaces.
Cut the nozzle at a 90° angle, then cut a 'V' notch in the tip to create a triangular bead. Apply to one surface, then press parts together firmly to compress the bead to no less than 2mm for optimal bond strength.
DANGER
This material is hazardous according to health criteria of Safe Work Australia. May cause an allergic skin reaction. May cause allergy or asthma symptoms or breathing difficulties if inhaled.
Wear gloves (Nitrile Rubber suitable for intermittent contact), apron, safety glasses, and a respirator. If an inhalation risk exists, wear an organic vapour/particulate respirator meeting AS/NZS 1715 and AS/NZS 1716 requirements.
Use with adequate ventilation. Ensure air concentrations remain below Exposure Standards. Use only in well-ventilated areas, or with local exhaust ventilation.
If poisoning occurs, contact a doctor or Poisons Information Centre (Australia 131 126, New Zealand 0800 764 766).
Store in dry and cool conditions between 10°C and 35°C. Shelf life is 12 months in original packaging. Dispose of contents/container in accordance with local, regional, national, and international regulations, preferably in an incinerator for hazardous waste.
Proper surface preparation is crucial for achieving optimum adhesion and preventing adhesion failure for Adheseal PU50FC.
Includes aluminium, waterproof membranes, anodised aluminium, stainless steel, PVC, galvanised steel, powder-coated metals, or glazed tiles.
Surface prep: Slightly roughen the surface with a fine abrasive pad. Clean and pre-treat using the two-wipe process with a suitable cleaner/solvent like Acetone or 100% White Spirits. Ensure cloths are clean and changed frequently.
Primer: Optional. Use Adheseal 50A surface prep. Once primed, allow no less than 30 minutes and no longer than 2 hours before applying the sealant. An adhesion test is advised for metals like copper, brass, titanium-zinc, and plastics like PVC.
Includes concrete, aerated concrete, cement-based renders, mortars, and bricks.
Surface prep: All surfaces must be structurally sound, stable, dry, and free of dust, loose material, oils, grease, and other contaminants. Substrate must be free from surface water and continual dampness. Concrete needs to cure for at least 28 days.
Primer: Required. Prime surface using Everflex Supaprime applied by brush. Once primed, allow no less than 30 minutes and no longer than 2 hours before applying the sealant.
Always perform an adhesion test on all substrates before full application to confirm compatibility and optimal performance. Primers promote adhesion and improve long-term performance, they are not a substitute for poor cleaning.
| Property | Value |
|---|---|
| Product Type | Polyurethane |
| Curing System | Moisture |
| Cure Rate | 3mm per 24 hours |
| Density | Black: 1.15; Others: 1.16 ± 0.02 |
| Shore A Hardness (14 days) | 45 |
| Joint Movement Capability | +/- 25% |
| Tear Strength (ISO 34) | 12 N/mm |
| Elongation to Break (ISO 37) | >700% |
| Modulus Elongation (ISO 37) | 0.8 MPa @ 100% |
| Application Temperature | +5°C to +35°C |
| Service Temperature | -40ºC to +90ºC |
| Working Time | 25 minutes @ 23ºC & 50% RH |
| Skinning Time | 60 minutes @ 23ºC & 50% RH |
| VOC (European 2004/42/CE) | 95 gm/lt |
| Shelf Life | 12 months |
| Storage Temperature | 10ºC to 35ºC |
| UV Resistance | Good |
| Chemical Resistance | Excellent for water, detergent solutions, moderately diluted acids & alkalis, petrol & oil for short periods |
| Packaging | 600ml foil sausages |
| Colours Available | Black, White, Grey |
Here are some common examples on where Adheseal PU50 Polyurethane Sealant used by our customers.
