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Adheseal PU-50FC: A Product Overview
For jobs that demand uncompromising strength and security, Adheseal PU-50FC is the only choice. This is not your standard sealant; it’s a high-modulus, single-component polyurethane engineered for structural adhesion and extreme durability. Its formulation delivers a tough, high-strength bond with exceptional mechanical and abrasion resistance, designed to perform in the most aggressive and demanding environments. When a standard sealant just won't cut it, PU-50FC provides the solution.
Its standout feature is an exceptionally high Shore A hardness, making it a preferred anti-pick sealant for institutional and public environments like prisons, schools, and transport hubs. But its strength doesn't come at the cost of flexibility. PU-50FC maintains permanent elasticity, accommodating constant movement and vibration, making it highly regarded for structural bonding in the truck body, vehicular, and marine manufacturing industries. When you need a bond that holds fast and resists tampering, you can rely on PU-50FC.
Shore A 50
Cures to an exceptionally hard and tough finish, providing maximum pick and tear resistance for high-security and high-impact applications.
Core Features & Specifications
- High Strength Structural Bond: Delivers a powerful, resilient bond with a tensile strength of 1.7 MPa, suitable for structural applications.
- Anti-Pick Hardness: The high modulus and Shore A 50 hardness make it extremely difficult to tamper with, gouge, or remove once cured.
- Fast Curing (FC) Formula: Excellent green strength and a rapid cure rate of 4mm per 24 hours means less clamping and waiting time.
- Extreme Durability: Offers superior tear strength (12.0 N/mm) and abrasion resistance, ideal for high-traffic pavement joints and demanding industrial use.
- Vibration & Impact Resistant: Maintains permanent flexibility to absorb constant vibration and impact, making it perfect for vehicular and marine manufacturing.
- Paintable Surface: Can be painted with most acrylic, oil, and rubber-based paints to match surrounding surfaces (compatibility test recommended).
The Adheseal PU-50FC Advantage
- Deliver Security & Peace of Mind: Use a true anti-pick sealant on institutional projects to prevent vandalism and ensure public safety, meeting stringent specifications.
- Create Unbreakable Bonds: Replace mechanical fasteners in some applications with a structural adhesive that withstands vibration, flexing, and heavy loads without failing.
- Maximise On-Site Efficiency: The fast-cure properties and excellent initial grab mean you can assemble and move components faster, increasing throughput and productivity.
- Build for the Harshest Conditions: Its toughness, chemical resistance, and suitability for below-waterline use means you can confidently tackle the most aggressive environments.
Applications in Practice: Trade Scenarios
For Institutional Maintenance: Anti-Pick Sealing in Public Areas
The Professional's Challenge
Joints around fixtures, windows, and panels in schools, prisons, or public amenities must resist tampering and vandalism. Standard soft sealants can be easily picked out, creating safety hazards and requiring constant, costly repairs.
The Adheseal Solution
Adheseal PU-50FC is the specified solution. Its Shore A 50 hardness cures to a tough, rubber-like consistency that is extremely difficult to damage or remove without specialised tools. It provides a secure, durable seal that significantly reduces maintenance cycles in high-traffic, high-abuse environments.
Best Practice Note
For maximum security, ensure the joint is designed with sufficient depth (min 10mm) to allow a solid body of sealant. Tool the sealant flush to make it harder to gain purchase on the edge.
For Vehicle & Truck Body Builders: Structural Panel Bonding
The Professional's Challenge
Bonding wall and roof panels on truck bodies, trailers, or caravans requires an adhesive that can replace or supplement mechanical fasteners. The bond must be incredibly strong, yet flexible enough to withstand constant road vibration, racking forces, and thermal expansion.
The Adheseal Solution
PU-50FC provides a flexible structural bond that excels in these conditions. Its high tensile and tear strength creates a tenacious bond between panels (metal, fibreglass, XPS foam core) and the frame, distributing stress evenly and dampening vibrations that would otherwise fatigue rivets and screws.
Best Practice Note
Apply in continuous triangular beads for optimal compression and surface area contact. Ensure surfaces are meticulously cleaned with a two-wipe process and primed with Adheseal 50A Surface Prep for maximum bond strength.
Frequently Asked Questions
What makes PU-50FC an "anti-pick" sealant?
Its anti-pick property comes from its very high Shore A hardness of 50. Unlike softer sealants that can be easily gouged or pulled out of a joint, PU-50FC cures to an extremely tough and tear-resistant consistency. This makes it incredibly difficult for individuals to tamper with or remove using fingers or simple tools, making it ideal for security-conscious applications.
Can I use PU-50FC for structural bonding applications?
Yes. Adheseal PU-50FC is designed for structural bonding where a high-strength, flexible bond is required. Its high tensile strength (1.7 MPa) and tear strength (12.0 N/mm) make it suitable for bonding construction materials, fabricating curtain walls, and for use in vehicle and marine manufacturing where it must withstand significant stress and vibration.
Will the white PU-50FC stay bright white outdoors?
Like many traditional polyurethanes, the white version of PU-50FC tends to discolour or yellow slightly over time when exposed to direct UV rays. While this does not affect the performance or integrity of the sealant, it is a cosmetic consideration. For colour-critical applications, the grey version is recommended, or the sealant can be painted over once fully cured.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Anti-Pick sealant for public & secure buildings | High Shore A 50 hardness prevents tampering, vandalism, and removal of the sealant. | Facility Maintenance, Correctional Services, Builders |
| Structural bonding of vehicle & marine panels | High tensile strength creates a durable, flexible bond that withstands constant vibration and stress. | Truck Body Builders, Marine Manufacturers, Engineers |
| High-traffic pavement & floor joints | Exceptional tear and abrasion resistance ensures longevity in demanding environments like car parks and driveways. | Civil Contractors, Concreters, Flooring Installers |
| Bonding XPS foam core & sandwich panels | Powerful adhesion and flexibility provides a structural bond for fabricating composite panels and facades. | Fabricators, Façade Installers |
| Seam sealing and bonding of bolted lap joints | Creates a tough, waterproof, and permanently elastic seal that reinforces mechanical fastenings. | Engineers, Fabricators, Sheet Metal Workers |
Applying Adheseal PU-50FC: Professional Protocol
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Surface Preparation
A high-strength bond is only as good as the surface it's applied to. Meticulous preparation is non-negotiable for performance.
Cleaning & Priming
All surfaces must be structurally sound, dry, and completely free of contaminants. Follow the substrate-specific priming guide for all applications to ensure a permanent, structural-grade bond.
Backing Rod & Joint Design
For sealant applications, install an open-cell foam backing rod to control sealant depth to the optimal 2:1 width-to-depth ratio and prevent three-sided adhesion, which restricts flexibility.
Pro Tip: Use high-quality masking tape to ensure neat, clean joint lines, especially for architectural finishes. Remove tape immediately after tooling. -
Application & Tooling
PU-50FC is a high-viscosity product. Use a high-quality application gun and apply steady pressure for a consistent bead.
As a Sealant
Cut the nozzle at a 45° angle. Push a solid bead of sealant ahead of the nozzle, forcing it into the joint and ensuring full contact with both primed surfaces.
As an Adhesive
Cut the nozzle at a 90° angle, then cut a 'V' notch in the tip to create a triangular bead. Apply to one surface, then press parts together firmly to compress the bead to no less than 2mm for optimal bond strength.
Timing: You have approximately 30 minutes of skin time at 23°C. All tooling must be completed within this window. Due to its high hardness, tooling can be more difficult than softer sealants.
Limitations & Safety
Product Limitations
Not suitable for internal swimming pool applications or areas with high chlorine exposure (maximum 5ppm).
Not suitable for structural glazing applications. Use a dedicated glazing silicone like Adheseal N-80 or N-60.
White colour may yellow when exposed to UV light. This is cosmetic and does not affect performance. Use Grey for colour-stable applications or paint over.
Not for use on natural stone without prior stain testing. For stone applications, use Adheseal S100.
Avoid use on bituminous surfaces, natural rubber, or EPDM, as leaching oils may interfere with adhesion.
Safety & Handling Requirements
Scheduled Substance
This material is a Scheduled Poison (S5 - Caution). It must be stored, handled, and used in accordance with all relevant regulations.
Personal Protective Equipment
Always wear protective gloves (Nitrile rubber recommended), safety glasses with side shields, and long-sleeved work clothing to prevent skin contact.
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 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 POISON CENTRE or doctor.
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, Masonry, Brick, 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 required for optimal adhesion
For all structural, high-stress, or water-immersion applications, priming is mandatory. Apply one coat of Everflex Supaprime with a brush and allow it to become touch-dry (30 mins to 2 hours) before applying sealant.
Everflex SupaprimeNon-Porous Substrates (Metals, Aluminium, Fibreglass)
Surface Preparation
Ensure surfaces are meticulously clean, dry, and free from any oils or grease. Use a two-wipe process with a suitable solvent like Xylene. Lightly abrading the surface with a fine abrasive pad is recommended to maximise the bond profile.
Primer required for critical applications
For all high-performance and structural bonding applications, priming is essential. Pre-treat the cleaned and abraded surface with Adheseal 50A Surface Prep applied with a clean cloth. Allow 30 mins to 2 hours before applying the adhesive sealant.
Adheseal 50A Surface Prep- Choosing a selection results in a full page refresh.