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When construction joints and cracks demand a reliable, flexible seal that cures fast, you need a polyurethane that gets the job done. Adheseal PU25FC delivers the peace of mind that comes with a robust, paintable seal for critical detailing. It's the go-to choice for preventing water ingress and protecting structures where durability and speed are non-negotiable.
Adheseal PU25FC became the industry standard because it pioneered speed in Australian polyurethane sealants. Before its introduction, polyurethanes cured slowly. The 'FC' in its name signifies 'Fast Curing', delivering a 60-minute skin time that dramatically reduces project delays. This product provides a tough, durable, and flexible seal for construction joints and cracks. It's formulated to accommodate movement up to ±25% of the joint width, ensuring a permanently elastic and dustproof finish in demanding applications. We engineered PU25FC to be a versatile, dependable workhorse for general construction and critical waterproofing details.
Adheseal PU25FC applies easily, tooling smoothly for a neat finish. Always ensure surfaces are clean, dry, and structurally sound. For optimal long-term adhesion, particularly on porous concrete or challenging non-porous substrates like galvanised steel, use the appropriate primer such as Adheseal 50A or Everflex Supaprime. Apply the sealant by pushing it firmly into the joint, ensuring full contact with both joint faces. Tool off within 15 minutes with a moistened spatula for a smooth, professional appearance. Clean fresh spills and tools with Xylene; cured product requires mechanical removal. If you mask edges for a cleaner line, remove the tape while the sealant is still wet.
Adheseal PU25FC is frequently specified as a final sealing element in critical waterproofing systems. For lift pits and retaining walls, it acts as the robust, flexible seal in the final step, applied after the primary membrane like Gripset 2P. In general crack and joint treatment, it's often the first product applied to fill and seal, working in conjunction with companion products like damp concrete primers and specialised epoxy concrete repair fillers to establish a sound substrate before the final sealant application. Its role is to provide durable, flexible closure, integral to the long-term performance of the system.
Adheseal PU25FC is certified to AS/NZS 4020, making it suitable for contact with potable water — a critical requirement for tanks and water storage applications. It has passed ASTM C793 for UV resistance, demonstrating good durability against environmental exposure, and is tested to AS1530.3 with low ignitability indexes, supporting its use in fire-rated assemblies. Its classification as ISO 11600 Type F Class 25 LM confirms its fitness for purpose as a non-sag, low modulus sealant with ±25% movement capacity, meeting international standards for joint sealants in construction. This product also boasts low VOC and meets Green Star environmental criteria.
Adheseal offers a range of high-performance polyurethanes, each engineered for specific demands. Adheseal PU25FC sits as the site-stock default, balancing fast cure, medium modulus, and versatility for general construction and detailing. Consider Adheseal PU15 when your primary requirement is greater movement capability (±50%), where a lower modulus sealant is needed to absorb extreme substrate shifts. In contrast, turn to Adheseal PU50 High-Modulus Polyurethane Adhesive when you require a higher modulus, anti-pick sealant for demanding structural applications, or where superior resistance to vandalism and traffic is paramount. PU25FC is your all-rounder, while PU15 and PU50 address the extremes of movement and hardness, respectively.
Adheseal PU25FC is a polyurethane sealant and adhesive for movement and connection joints. It is commonly used for perimeter sealing of windows, expansion joints in precast panels, and general construction or manufacturing where flexibility and strong adhesion are required.
Yes, once cured, Adheseal PU25FC is suitable for contact with potable water. It has been tested to AS/NZS 4020, confirming its safety for water intended for human consumption.
Adheseal PU25FC has a joint movement capability of ±25%. This high elasticity allows it to accommodate significant expansion and contraction without cracking or losing adhesion, as tested to ASTM C 719.
No, Adheseal PU25FC is not suitable for aquariums. It is also not recommended for internal swimming pool installations due to potential exposure to high levels of chlorine.
| Application | Key benefit | Primary trades |
|---|---|---|
| Perimeter sealing of windows and curtain walls | Forms a permanently elastic and dustproof seal with ±25% movement capability, resisting weathering and UV exposure. | Glaziers, Builders, Facade Installers |
| Expansion joints in precast/tilt-up panels, pavement, car parks, driveways | Accommodates significant structural movement while maintaining a waterproof, flexible joint, with proven long-term durability. | Concreters, Builders, Civil Contractors |
| Metal cladding and bolted lap joints | Provides excellent adhesion to most metals (including galvanised and powder-coated) and is non-corrosive, ensuring a robust and lasting bond. | Cladders, Sheet Metal Workers, Builders |
| Vehicular and marine manufacturing | Offers strong adhesion, high flexibility, and is suitable for below-waterline applications once cured, making it resistant to harsh conditions. | Marine Fabricators, Vehicle Manufacturers |
| General construction sealing and adhering | Fast curing (3mm/day), paintable, low ignitability (AS1530.3), and suitable for potable water contact (AS/NZS 4020) providing versatility and compliance. | Builders, Plumbers, Tilers, General Trades |
Correct joint design is critical for performance. Ensure all surfaces are sound, clean, dry, and free of all contaminants. Concrete must be cured for 28 days.
Maintain a 2:1 width-to-depth ratio. For external joints, minimum width should be 12mm. For internal, 5mm. Use masking tape for neat joint lines.
Insert Adhefoam open cell backer rod, sized 25% larger than the joint width, to control the sealant depth and critically, to prevent 3-sided adhesion.
For optimal, long-term adhesion and in all critical applications, priming is mandatory.
Apply one coat of Everflex Supaprime to concrete, render, brick, or timber.
After cleaning and abrading, apply Adheseal 50A Surface Prep to aluminium, powder coat, or PVC.
Apply sealant at temperatures between +5°C and +35°C. Cut nozzle at a 45° angle to the desired bead size.
Hold the gun at a 45° angle and push the sealant ahead of the nozzle. This ensures the sealant is forced firmly into the joint and prevents air entrapment, which can cause bubbles.
Tool the sealant with a moistened spatula to create a smooth, concave finish. This ensures good contact with the joint sides for maximum adhesion.
DANGER
May cause an allergic skin reaction. May cause allergy or asthma symptoms or breathing difficulties if inhaled.
Wear protective clothing, gloves (Nitrile Rubber recommended 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.
Ensure adequate ventilation to maintain air concentrations below exposure standards. Use only in well-ventilated areas. Avoid generating and inhaling dusts.
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 correct primer selection are critical for achieving optimal adhesion and long-term joint performance with Adheseal PU25FC.
Examples include concrete, aerated concrete, cement-based renders, mortars, and bricks.
Surface prep: Surfaces must be structurally sound, dry, and free of dust, loose material, oils, and other contaminants. Concrete needs at least 28 days to cure.
Primer: Required. Prime surfaces using Everflex Supaprime, applied by brush. Allow a minimum of 30 minutes and a maximum of 2 hours for solvent evaporation before applying the sealant.
Examples include aluminium, stainless steel, galvanised surfaces, powder-coated metals, PVC, and glazed tiles.
Surface prep: Slightly roughen the surface with a fine abrasive pad. Ensure surfaces are clean and free of oils, grease, and other contaminants. For impervious substrates, use the two-wipe process with Acetone or 100% White Spirits, changing cloths frequently.
Primer: Optional, but recommended for optimal long-term adhesion. Pre-treat using Adheseal 50A surface prep applied with a clean cloth. Allow a minimum of 30 minutes and a maximum of 2 hours for solvent evaporation before applying the sealant. An adhesion test is advised for metals like copper, brass, titanium-zinc, and plastics such as PVC.
| Property | Value |
|---|---|
| Product Type | Polyurethane |
| Curing System | Moisture |
| Cure Time Rate | 3 mm / 24 Hours |
| Density (Black) | 1.15 g/cm3 |
| Density (Others) | 1.16 ± 0.02 g/cm3 |
| Shore A Hardness | 25 (after 14 days) |
| Joint Movement Capability | ± 25% |
| Tear Strength (ISO 34) | 6.5 N/mm |
| Elongation to Break (ISO 8339) | > 400% |
| Modulus Elongation (ISO 8339) | 0.4 MPa @ 100% |
| Application Temperature | +5°C to +35°C |
| Service Temperature | -40ºC to +80ºC |
| Working Time | 25 min @ 23ºC & 50% RH |
| Skinning Time | 60 min @ 23ºC & 50% RH |
| VOC (ISOLEMFI 50134C Mono) | < 1.5 g/l |
| VOC (European 2004/42/CE) | 95 g/l |
| Shelf Life | 12 months in original packaging |
| Storage Temperature | Cool Dry between 10ºC and 35ºC |
| 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 |
| Accelerated Testing UV & Weathering | No chalking, no cracks or yellowing (beyond ASTM C793-05, ISO11431 & ISO EN 14187-8) |
| AS1530.3 Test Report 23-000124 AWTA | Ignitability Index 0, Spread of Flame Index 0, Heat Evolved Index 0, Smoke Developed Index 0-1 |
| Colors | Black, White, Concrete Grey |
| Packaging | 600ml Foil Sausage, 310ml Cartridge |
Here are some common examples on where Adheseal PU25 Polyurethane Adhesive used by our customers.
Civil Construction
When sealing or repairing expansion joints and cracks in concrete floors, pavements, or precast panels.
Fast cure and durable flexibility ensure quick project turnaround and long-term joint integrity against movement and environmental factors.
Civil Construction
When sealing expansion joints in precast panels, car parks, or driveways subject to structural movement and traffic.
Its robust elasticity and tear resistance ensure durable, flexible seals that absorb significant structural movement without failure.
Glazing
Sealing perimeter joints around windows, curtain walls, or metal cladding exposed to UV, weather, and thermal cycling.
Provides a permanently elastic, UV-resistant, and paintable seal that accommodates thermal expansion and contraction.
Waterproofing
Sealing construction joints in lift pits, retaining walls, or other structures requiring a robust, flexible, and potable water compliant seal.
It forms a permanent, flexible, and mould-resistant barrier crucial for waterproofing systems, especially when potable water contact is a concern.
Roofing
Sealing joints and imperfections on concrete roof slabs before membrane application, ensuring a stable, flexible base.
Its fast cure and fire-tested properties allow for quick membrane application, providing a secure, low-ignitability seal on concrete surfaces.
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Plan your sealant volume and units in seconds.
Formula: Volume (ml) = Length (m) x Width (mm) x Depth (mm) x 0.001
Provides estimates for planning purposes. For critical applications, consult a qualified professional.
