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Adheseal PU25 FC: A Product Overview
When you need one sealant that can handle almost anything you throw at it, you reach for Adheseal PU25 FC. This is one of Australia's most versatile polyurethane sealants, engineered for professionals who demand performance without compromise. It’s a single-component, moisture-curing formula that works as both a powerful adhesive and a permanently flexible sealant. The 'FC' stands for Fast Curing, meaning less downtime on site and faster project completion, so you can move on to the next job with confidence.
From precast panels and pavement joints to below-waterline marine applications, PU25 FC delivers exceptional adhesion and durability. It accommodates joint movement up to ±25%, preventing failures and callbacks. Critically, it is tested to AS/NZS 4020, making it suitable for contact with potable (drinking) water. Tough, easy to tool, and paintable, it's the reliable, user-friendly solution for countless indoor and outdoor tasks.
AS/NZS 4020
Certified for use in contact with potable (drinking) water, making it the trusted choice for sealing water tanks and plumbing applications.
Core Features & Specifications
- Fast Curing (FC) Formulation: Achieves a skin in 30-40 minutes and cures at 3mm per 24 hours, significantly reducing job time.
- Potable Water Certified: Fully tested to AS/NZS 4020 standards, ensuring it is safe for contact with drinking water.
- High Movement Capability: With ±25% joint movement capability (ASTM C 719), it handles structural expansion and contraction without failing.
- Exceptional Adhesion: Bonds to virtually all common construction materials including concrete, timber, metal, aluminium, fibreglass, and powder coat.
- Below Waterline Use: Once fully cured, it is suitable for applications below the waterline in marine environments.
- Low Ignitability: Tested to AS 1530.3, demonstrating low ignitability, which is a critical factor for specified projects.
The Adheseal PU25 FC Advantage
- Unmatched Versatility: Use one product for sealing, bonding, waterproofing, and even potable water applications. Simplify your inventory and always have the right solution on hand.
- Meet Critical Specifications: With certifications for potable water (AS/NZS 4020) and fire performance (AS 1530.3), you can confidently use PU25 FC on projects with the strictest compliance requirements.
- Increase On-Site Productivity: The fast-curing nature means joints are weather-resistant and surfaces are paint-ready sooner, helping you stick to tight schedules.
- Deliver a Permanent Solution: Its high tear resistance, UV stability, and mould inhibition mean your work will last, protecting your reputation and preventing costly callbacks.
Applications in Practice: Trade Scenarios
For Plumbers & Tank Installers: Sealing Potable Water Tanks
The Professional's Challenge
Sealing joints, fittings, or cracks in a drinking water tank requires a sealant that is not only waterproof and flexible but also certified non-toxic and safe for human consumption to meet health and safety regulations.
The Adheseal Solution
Adheseal PU25 FC is tested to AS/NZS 4020, making it the compliant choice. Its exceptional adhesion to metal, concrete, and plastic substrates ensures a permanent waterproof seal. Ensure the product is fully cured as per the TDS before the tank is filled to ensure complete compliance.
Best Practice Note
For the best possible bond on metal surfaces, ensure they are meticulously cleaned and pre-treated with Adheseal 50A Surface Prep. Allow the sealant to cure for a minimum of 7 days before filling the tank.
For Concreters & Civil Contractors: Pavement Joints
The Professional's Challenge
Joints in concrete driveways, car parks, and pavements must withstand heavy traffic, weather exposure, and chemical spills while accommodating thermal expansion and contraction. A weak sealant will quickly tear and fail, leading to water ingress and concrete degradation.
The Adheseal Solution
PU25 FC's high tear strength (6.5 N/mm) and Shore A hardness of 25 create a tough, resilient seal that resists damage. Its ±25% movement capability handles the constant expansion and contraction of concrete slabs, ensuring a durable, long-lasting joint that stays sealed.
Best Practice Note
Ensure new concrete has cured for at least 28 days. Prime the joint with Everflex Supaprime to guarantee maximum adhesion and longevity, especially in high-traffic areas.
Frequently Asked Questions
Is PU25 FC actually safe to use in drinking water tanks?
Yes. Adheseal PU25 FC has been independently tested and certified to AS/NZS 4020:2005, which is the Australian standard for products in contact with drinking water. This makes it a compliant and safe choice for sealing joints and fittings in potable water containers, provided it is allowed to cure fully before use.
How much faster is the "Fast Cure" compared to other polyurethanes?
Adheseal PU25 FC achieves a tack-free skin in approximately 30-40 minutes under standard conditions (23°C & 60% RH). This is significantly faster than many standard polyurethanes, which can take several hours. This allows for earlier resistance to weather and damage, and means you can often paint or move to the next stage of the job on the same day.
Can I use PU25 FC as a glue for things like skirting boards?
Absolutely. PU25 FC is a powerful sealant and adhesive. It has exceptional grab and is ideal for bonding timber skirting boards and floor mouldings to walls, as well as acoustic tiles, display signs, and other lightweight components. It provides a strong, durable bond that remains flexible, preventing it from cracking with building movement.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Sealing potable water tanks and fittings | AS/NZS 4020 certification ensures it is non-toxic and safe for contact with drinking water. | Plumbers, Tank Installers, Maintenance |
| Expansion joints in concrete pavements & car parks | High tear resistance and ±25% movement capability withstands traffic and thermal movement. | Concreters, Civil Contractors, Builders |
| Bonding floor mouldings and skirting boards | Acts as a powerful adhesive with excellent grab, providing a flexible bond that won't crack. | Carpenters, Shopfitters, Cabinet Makers |
| Marine applications (below waterline) | Once cured, it creates a durable, waterproof seal that withstands permanent water immersion. | Boat Builders, Marine Maintenance |
| Perimeter sealing of windows and metal cladding | Fast-curing formula speeds up weatherproofing, while high flexibility prevents leaks. | Window Installers, Façade Installers, Builders |
Applying Adheseal PU25 FC: Professional Protocol
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Joint Preparation & Priming
A professional result starts with meticulous preparation. Ensure the joint is correctly formed and surfaces are immaculate before application.
Surface Cleaning & Masking
All surfaces must be structurally sound, dry, and free of all contaminants. To ensure sharp, clean lines, mask the edges of the joint with high-quality painter's tape.
Backing Rod Installation
For joints deeper than 10mm, install an open-cell foam backing rod 25% larger than the joint width. This controls sealant depth to the optimal 2:1 width-to-depth ratio and prevents three-sided adhesion.
Pro Tip: When priming, avoid excessive application. Puddles of primer at the base of the joint can compromise the seal. A thin, consistent coat is all that's required. -
Application & Tooling
Apply the product with a steady hand to ensure the joint is completely filled without entrapping air, which can cause bubbling.
As a Sealant
Cut the nozzle at a 45° angle. Hold your sausage gun at a 45° angle and push a continuous bead of sealant ahead of the nozzle, ensuring it makes full contact with both sides of the joint.
As an Adhesive
Cut the nozzle at a 90° angle, then cut a 'V' notch in the tip. Apply a triangular bead to one surface. Press the two surfaces together firmly to compress the bead to no less than 2mm, ensuring good transfer.
Timing: You have a working time of 30-40 minutes to tool the sealant before it skins. Remove masking tape immediately after tooling for the cleanest possible edge.
Limitations & Safety
Product Limitations
Not suitable for internal swimming pool applications or areas with high chlorine exposure (maximum 5ppm).
Do not apply in totally sealed or confined spaces, as the product requires atmospheric humidity to cure.
Not suitable for structural glazing. Use a dedicated glazing silicone like Adheseal N-80 or N-60.
Do not use on natural stone like marble or granite without conducting a comprehensive stain test first. For stone, Adheseal S100 is recommended.
Avoid use on bituminous surfaces, natural rubber, or EPDM, as leaching oils may cause discolouration and adhesion failure.
Safety & Handling Requirements
Personal Protective Equipment
Always wear protective gloves (Nitrile rubber recommended), safety glasses with side shields, and long-sleeved work clothing to prevent skin contact.
Ventilation & Respiratory
Use only in well-ventilated areas. In case of inadequate ventilation, wear an organic vapour/particulate respirator meeting AS/NZS 1715 & 1716 standards.
Emergency First Aid
Eyes:
Rinse opened eye for several minutes under running water. Then consult a doctor.
Skin:
May cause an allergic reaction. Immediately wash with plenty of soap and water. If skin irritation or rash occurs, get medical advice.
Inhaled:
May cause allergy or asthma symptoms. Remove to fresh air. If experiencing respiratory symptoms, call a doctor or POISON CENTRE.
Swallowed:
DO NOT induce vomiting. Seek immediate medical advice.
If poisoning occurs, contact a doctor or Poisons Information Centre (Phone Australia 131 126).
Substrate Preparation & Priming Guide
Porous Substrates (Concrete, Brick, Mortar, Timber)
Surface Preparation
Surfaces must be structurally sound, dry, and clean. Remove all dust, laitance, loose material, oils, and curing compounds. New concrete must be allowed to cure for a minimum of 28 days before application.
Primer Requirements
Primer required for optimal adhesion
For critical applications, high-stress joints (like pavements), or for surfaces exposed to extreme weather or water immersion, priming is essential. Apply one coat of Everflex Supaprime with a brush and allow to become touch-dry (30 mins to 2 hours) before applying sealant.
Everflex SupaprimeNon-Porous Substrates (Metals, Aluminium, Powder Coat)
Surface Preparation
Ensure surfaces are clean, dry, and free from any oils or grease. Use a two-wipe process with a suitable solvent like Xylene on a clean, lint-free cloth. Lightly abrading the surface with a fine abrasive pad can improve the bond on powder-coated or anodized metals.
Primer Requirements
Primer recommended for critical applications
While PU25 FC has excellent adhesion, priming is best practice for multi-story buildings, highly stressed joints or below-waterline use. Pre-treat the cleaned surface with Adheseal 50A Surface Prep. Allow 30 mins to 2 hours before applying sealant.
Adheseal 50A Surface Prep- Choosing a selection results in a full page refresh.