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Adheseal PU25 Polyurethane Sealant: A Product Overview
Adheseal PU25FC is a medium modulus, fast-curing polyurethane sealant and adhesive developed for trades that need strength, flexibility, and speed without compromise. It’s one of Australia’s most versatile sealants—job-site ready and proven across construction, infrastructure, marine, and manufacturing environments.
With ±25% movement capability and a tougher cured profile than low modulus sealants, PU25FC bridges the gap between flexible joint sealing and high-strength adhesion. Once cured, it forms a permanently elastic, waterproof joint that stands up to traffic, vibration, and exposure—first-time-right with predictable performance.
Its fast skin and cure characteristics reduce downtime, protect margins, and keep projects moving without sacrificing durability.
Key Features of Adheseal PU25
- Fast curing (FC): reduces downtime and accelerates job completion.
- ±25% movement capability: manages expansion and contraction without tearing.
- Medium modulus polyurethane: higher strength than low modulus sealants while retaining flexibility.
- Excellent adhesion to concrete, masonry, metals, timber, powder coat and membranes.
- Suitable for potable water contact: tested to AS/NZS 4020.
- UV and weather resistant: passed ASTM C793 with proven external durability.
- Low VOC, low odour: meets Green Star environmental criteria.
- Non-corrosive and mould resistant: reliable in hot, humid Australian conditions.
The Adheseal PU25 Advantage
- Fast cure keeps projects on schedule and reduces site downtime.
- Stronger cured profile handles traffic, vibration, and mechanical stress.
- One product for sealing and bonding—simplifies stock and workflow.
- Paintable finish integrates cleanly with surrounding surfaces.
- Backed by Adheseal technical support and pre-installation adhesion testing.
Adheseal tips for using PU25
Scenario: Applying in confined or sealed spaces
Potential Outcome: Incomplete cure due to lack of atmospheric humidity.
Adheseal Best Practice: Ensure adequate airflow and humidity exposure—PU25 cures predictably when it can breathe.
Scenario: Incorrect joint geometry
Potential Outcome: Excessive stress and premature joint failure.
Adheseal Best Practice: Maintain a 2:1 width-to-depth ratio and use backing rod to control depth and movement.
Applications in Practice: Trade Scenarios
For Builders & Civil Contractors: Pavements and Car Parks
The Professional's Challenge
Pavement and car park joints demand flexibility, strength, and rapid return to service.
The Adheseal Solution
PU25FC cures fast and delivers a tougher joint that handles movement and traffic loads. Success means earlier reopening and fewer long-term repairs.
Best Practice Note
Tool off within skin time to achieve a dense, traffic-ready finish.
For Fabricators & Installers: Metal Cladding and Lap Joints
The Professional's Challenge
Metal joints move and vibrate, breaking down rigid sealants over time.
The Adheseal Solution
PU25FC combines adhesion strength with controlled flexibility, maintaining a waterproof seal under movement. Success means cleaner installs and fewer warranty issues.
Best Practice Note
Lightly abrade and prime metals for maximum long-term adhesion.
Frequently Asked Questions
What makes PU25 different from standard polyurethane sealants?
Adheseal PU25FC is a medium modulus, fast-curing polyurethane, offering higher strength and faster return to service than standard sealants.
Is PU25 suitable for potable water contact?
Yes. PU25 has been tested to AS/NZS 4020 and is suitable for contact with potable water once fully cured.
Can PU25 be used as both a sealant and adhesive?
Yes. PU25FC functions as both a sealant and an adhesive, making it ideal for bonding and sealing in one application.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Expansion joints in precast / tilt-up panels | High movement capability (±25%) prevents tearing. | Builders, Concreters, Remedial |
| Perimeter sealing of windows & curtain walls | Excellent adhesion to aluminium; paintable for a clean finish. | Glaziers, Façade Installers, Builders |
| Pavement joints, car parks, driveways | Tear-resistant and durable to withstand traffic. | Concreters, Landscapers |
| Metal cladding & bolted lap joints | Non-corrosive and weatherproof; fast curing. | Roofers, Plumbers, Shed Builders |
| Potable water applications (tanks, pipes) | Certified to AS/NZS 4020 for contact with drinking water. | Plumbers, Maintenance, Civil |
| General adhesive (skirting, acoustic panels) | Tough, flexible bond; replaces mechanical fixings. | Carpenters, Joiners, Fit-out |
| Vehicular and marine manufacturing | High-strength adhesive/sealant for seam sealing. | Manufacturers, Auto Body, Marine |
Applying Adheseal PU-25FC: Enhanced Protocols & Best Practices
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Step 1: Joint Design & Preparation
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.
Joint Dimensions
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.
Backing Rod
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.
Pro Tip: Preventing 3-sided adhesion is the most important step for a flexible joint that will not fail. If the joint is too shallow for a rod, you must use a bond-breaker tape at the base. -
Step 2: Priming
For optimal, long-term adhesion and in all critical applications, priming is mandatory.
Porous Surfaces
Apply one coat of Everflex Supaprime to concrete, render, brick, or timber.
Non-Porous Surfaces
After cleaning and abrading, apply Adheseal 50A Surface Prep to aluminium, powder coat, or PVC.
Timing: Allow primer to become touch-dry (minimum 30 minutes, maximum 2 hours) before applying sealant. -
Step 3: Application & Tooling
Apply sealant at temperatures between +5°C and +35°C. Cut nozzle at a 45° angle to the desired bead size.
Application
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.
Tooling
Tool the sealant with a moistened spatula to create a smooth, concave finish. This ensures good contact with the joint sides for maximum adhesion.
Timing: Working time is approximately 25 minutes. You must tool the joint and remove any masking tape within this window, before the sealant skins.Pro Tip: For clean-up of uncured sealant, use Xylene. For skin, use Adheseal Hand Wipes. Cured sealant can only be removed mechanically.
Limitations & Safety
Product Limitations
Moisture Cure: Not suitable for totally confined spaces. Product requires atmospheric humidity to cure.
Chlorine Exposure: Not suitable for internal swimming pool applications or areas with high chlorine exposure (max 5ppm).
Substrate Incompatibility: Do not use on bituminous, natural rubber, or EPDM surfaces. May discolour copper and brass.
Specific Applications: Not intended for structural glazing (use Adheseal N-80) or adhering mirrors.
Natural Stone: Always conduct a stain test before using on any natural stone. Adheseal S100 is generally recommended for marble and granite.
Safety & Handling Requirements
Personal Protective Equipment
Wear suitable protective clothing, safety glasses, and chemical-resistant gloves (e.g., Nitrile Rubber).
Ventilation Requirements
Use only in well-ventilated areas. If inhalation risk exists (e.g., in confined spaces), wear an organic vapour/particulate respirator meeting AS/NZS 1715/1716.
Hazard Warnings
May cause an allergic skin reaction (H317). May cause allergy or asthma symptoms or breathing difficulties if inhaled (H334). Avoid breathing vapours.
Emergency First Aid
Eyes:
Rinse opened eye for several minutes under running water. Then consult a doctor.
Skin:
Immediately wash with water and soap and rinse thoroughly. If skin irritation or rash occurs, get medical advice.
Inhaled:
Remove victim to fresh air. If experiencing respiratory symptoms, call a POISON CENTRE or doctor.
Swallowed:
If swallowed, do not induce vomiting. Seek medical advice immediately.
Seek medical attention immediately in all cases of serious exposure.
Adheseal PU-25FC Adhesion & Preparation Guide
Porous Substrates (Concrete, Brick, Mortar, Timber)
Surface Preparation
Surfaces must be structurally sound, stable, dry, and 100% free of all dust, laitance, form release agents, and contaminants. Concrete must be allowed to cure for a minimum of 28 days.
Primer Requirements
Primer Required
For optimal adhesion and for all critical, high-stress, or water-immersion applications, priming is mandatory. Apply one coat of Everflex Supaprime by brush and allow to dry (30-120 minutes) before sealing.
Everflex SupaprimeNon-Porous Substrates (Aluminium, Powder Coat, PVC)
Surface Preparation
Slightly roughen the surface with a fine abrasive pad. Clean thoroughly using the two-wipe process with a clean, lint-free cloth and a solvent such as Xylene. Ensure surface is completely dry.
Primer Requirements
Primer Required
Pre-treat the cleaned surface with Adheseal 50A Surface Prep applied with a clean cloth. Allow to dry (30-120 minutes) before sealing to ensure a permanent, chemical bond.
Adheseal 50A Surface PrepProblematic Substrates (Copper, Brass, EPDM, Bitumen)
Surface Preparation
These substrates are generally not recommended for use with PU-25FC. The sealant may discolour copper and brass, and it will not adhere to bituminous or EPDM rubber surfaces.
Primer Requirements
Not Recommended
Do not use. Select an alternative sealant, such as a neutral cure silicone for copper/brass, after conducting an adhesion test.
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