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Adheseal PU25 is a medium modulus, fast-curing polyurethane sealant and adhesive engineered for high-movement construction joints in precast panels and civil infrastructure. This moisture-curing formula accommodates ± 25% movement capability while maintaining high tear resistance for trafficable pavement and car park applications.
Certified to AS/NZS 4020 for potable water contact and tested to AS1530.3 for low ignitability, it provides a reliable, fire-safety compliant solution for submersible and commercial environments. To prevent adhesive failure or sealant rupture, contractors must maintain a 2:1 width-to-depth ratio and use a backing rod to avoid 3-sided adhesion.
Ensure concrete has cured for a minimum of 28 days before application to mitigate risks of delamination and biological growth.
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.
| Document | Download |
|---|---|
| Adheseal PU25 Technical Data Sheet | |
| Adheseal PU25 Safety Data Sheet |
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