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For perimeter window sealing, precast concrete panels, and joint connections requiring high durability, Adheseal PU15 Polyurethane Adhesive is a low-modulus elastomeric sealant and adhesive. It accommodates significant thermal and structural movement, curing via atmospheric moisture to create a permanently flexible, dustproof, and waterproof seal across dissimilar construction materials.
Adheseal PU15 is formulated for applications requiring high joint elasticity and tear resistance. Classified as Type F Class 25 LM under ISO 11600, it accommodates structural joint movement up to ±25%. This high flexibility prevents cohesive or adhesive failure when sealing materials with different thermal expansion coefficients. The polyurethane chemistry provides excellent long-term weathering, UV resistance, and resistance to mould and mildew in hot, humid environments, making it suitable for both internal and external installations.
Adheseal PU15 adheres to a broad range of building substrates, including masonry, brick, stone, timber, plastics, painted surfaces, rubber, fibreglass, porcelain, powder-coated metals, and waterproof membranes. It is suitable for:
All substrates must be structurally sound, dry, clean, and free of oils, grease, curing compounds, and surface water. Concrete must be cured for at least 28 days to prevent moisture-related adhesion failure or mould growth. Use a clean, two-wipe solvent process (using Acetone or 100% White Spirits) for non-porous surfaces.
To prevent joint failure, design joints to a 2:1 width-to-depth ratio. Internal joints require a minimum width and depth of 5mm; external joints require a minimum of 10mm. The maximum allowable joint width is 30mm with a 15mm depth. For joints deeper than 10mm, install a backing rod 25% larger than the joint width. Prevent three-sided adhesion by applying polyethylene release tape on flat joints.
Apply when temperatures are between 5°C and 40°C. While wet, tool the joint with a moistened spatula within 15 minutes. Wet clean-up must be completed using Xylene; cured material must be removed mechanically.
Where priming is required to improve long-term adhesion, apply the primer with a clean brush and allow no less than 30 minutes and no longer than 2 hours before applying the sealant:
Adheseal PU15 is a low modulus sealant with a joint movement capability of ±30%. This allows it to accommodate significant expansion and contraction in construction joints, reducing the risk of seal failure.
No, Adheseal PU15 is not suitable for internal swimming pool applications. It should not be exposed to chlorine levels exceeding 5ppm to ensure long-term performance and prevent degradation.
For non-porous metals like anodized aluminium or powder-coated surfaces, pre-treatment with Adheseal 50A is recommended. For porous substrates such as concrete or bricks, prime with Everflex Supaprime. An adhesion test is always advised to confirm specific requirements.
PU15 is a moisture-curing sealant and requires atmospheric humidity to cure properly. It is not suitable for use in totally confined spaces where access to moisture vapour is restricted, as this will prevent it from setting.
| Application | Key benefit | Primary trades |
|---|---|---|
| Perimeter sealing of windows and fenestration details | Maintains a waterproof, flexible joint with ±30% movement capability and good weather resistance. | Glaziers, Builders, Window Fabricators |
| Expansion joints in precast and tilt-up panels | Accommodates substantial structural movement, offering long-term durability and resistance to weathering. | Precast Installers, Concrete Contractors, Builders |
| Sealing metal cladding, aluminium fabrication, and bolted lap joints | Excellent adhesion to metals and powder coat, non-corrosive, and maintains a flexible seal for varied thermal expansion. | Metal Fabricators, Cladders, Commercial Builders |
| General construction sealing and adhesive for lightweight components | Versatile for sealing most common building materials, offering high permanent flexibility and low VOC for diverse projects. | General Builders, Joiners, Shopfitters, Manufacturers |
Proper preparation is critical for a long-lasting seal. Ensure the joint is correctly designed and the substrate is ready to accept the sealant.
All surfaces must be structurally sound, stable, dry, and free of dust, oils, grease, and any other contaminants. Use the two-wipe process with Xylene on non-porous surfaces.
Install an open-cell foam backing rod 25% larger than the joint width to control sealant depth and prevent three-sided adhesion. The ideal sealant depth should be half the joint width (2:1 ratio).
Apply the sealant with a steady, consistent motion to ensure the joint is completely filled without entrapping air.
Cut the nozzle at a 45° angle. Hold your sausage gun at a 45° angle and push the sealant ahead of the nozzle, ensuring it makes full contact with both sides of the joint.
Immediately after application, tool the sealant with a moistened spatula or finishing tool to create a smooth, concave finish. This ensures good contact and a professional look.
Danger: Adheseal PU15 is hazardous according to Safe Work Australia criteria. May cause an allergic skin reaction or allergy/asthma symptoms if inhaled.
Wear protective clothing, gloves (nitrile rubber recommended for intermittent contact), apron, safety glasses, and a suitable respirator (organic vapour/particulate respirator meeting AS/NZS 1715 and AS/NZS 1716 if inhalation risk exists).
Ensure ventilation is adequate to maintain air concentrations below Exposure Standards. Use only in well-ventilated areas, or with local exhaust ventilation.
Store in dry and cool conditions between 10ºC and 35ºC. 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 and primer selection are critical for Adheseal PU15 to ensure reliable adhesion and long-term joint performance.
Surface prep: Surfaces must be clean, dry, and free of contaminants. Lightly roughen the surface with a fine abrasive pad. Then clean with Adheseal 50A surface prep on a clean cloth, using a two-wipe process.
Primer: Required. Apply Adheseal 50A. Allow 30 minutes to 2 hours for drying before sealant application. An adhesion test is advised for copper, brass, titanium-zinc, and some plastics.
Surface prep: Ensure surfaces are structurally sound, dry, and free of dust, oils, and other loose material. Concrete must be cured for at least 28 days to prevent adhesion issues.
Primer: Required. Prime the surface with Everflex Supaprime using a brush. Allow 30 minutes to 2 hours for drying before sealant application.
Surface prep: Clean, dry, and free from loose paint or contaminants. For painted surfaces, confirm the paint is sound and compatible.
Primer: Optional, subject to adhesion testing. Always perform a preliminary adhesion test on a small area to determine if a primer is necessary.
| Property | Value |
|---|---|
| Type of Product | Polyurethane |
| Curing System | Moisture |
| Cure Time Rate | 3mm / 24Hours |
| Density Black | 1.16 g/cm3 |
| Density Others | 1.18±0.02 g/cm3 |
| Shore A Hardness | 15 (after 14 days) |
| Joint Movement Capability | ±25% |
| Tear Strength (ISO 34) | 5.5 N/mm |
| Elongation to Break (ISO 37) | >600% |
| Modulus Elongation (ISO 37) | 0.2 MPa @ 100% |
| Application Temperature | +5°C to +35°C |
| Service Temperature | -40°C to +80°C |
| Working Time | 25 minutes @ 23°C & 50% RH |
| Skinning Time | 60 minutes @ 23°C & 50% RH |
| VOC (European 2004/42/CE) | 95 gm/lt |
| Shelf Life | 12 months in original packaging |
| Storage | Cool Dry between 10°C and 35°C |
| UV Resistance (500h) | Good |
| Chemical Resistance | Excellent for water, detergent solutions, moderately diluted acids & alkalis, petrol & oil for short periods |
| Sealant Classification (ISO 11600) | Type F Class 25 LM |
| Fire Test (AS/NZ 3837) | Intumesced for a few seconds at 60kW/m2 exposure |
| Form | Paste |
| Odour | Slight odour |
| Solubility in Water | Insoluble |
| Specific Gravity | ~1.17 |
| Flash Point | >70 °C (ISO3679) |
| Autoignition Temperature | >200 °C |
Here are some common examples on where Adheseal PU15 Polyurethane Adhesive used by our customers.
