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Adheseal PU50 Polyurethane Sealant: A Product Overview
Adheseal PU50FC is a high modulus, fast-curing polyurethane adhesive and sealant built for the most demanding applications. With exceptional mechanical strength, abrasion resistance, and permanent elasticity, it’s trusted where failure is not an option.
Featuring a high Shore A hardness of approximately 55, PU50FC delivers a tough, anti-pick finish suitable for public buildings, schools, correctional facilities, and hostile environments. At the same time, it maintains enough flexibility to absorb constant movement and vibration without cracking.
From structural bonding and facade systems to marine and vehicular manufacturing, PU50FC provides predictable performance, high green strength, and long-term durability—job done right, first time.
Key Features of Adheseal PU50
- High modulus polyurethane: delivers structural-strength bonding with controlled flexibility.
- Shore A hardness ~55: tough, anti-pick finish suitable for public and high-risk environments.
- Fast curing (FC): excellent green strength and faster progression on site.
- Exceptional mechanical and abrasion resistance: built for aggressive conditions.
- Elongation >700%: absorbs vibration and movement without joint failure.
- Excellent adhesion to metals, concrete, masonry, timber, powder coat and membranes.
- Paintable after cure: compatible with acrylic, oil and rubber-based paints.
- Low VOC and low odour: meets Green Star environmental criteria.
The Adheseal PU50 Advantage
- Handles structural loads while staying flexible under movement and vibration.
- Anti-pick performance protects finishes in public and high-abuse areas.
- Fast green strength reduces clamping time and accelerates installation.
- One product for bonding and sealing in harsh environments.
- Backed by Adheseal technical expertise and bond adhesion testing support.
Adheseal tips for using PU50
Scenario: Using low-strength sealants in high-abuse areas
Potential Outcome: Picking, tearing, and premature joint failure.
Adheseal Best Practice: Specify PU50FC for high-risk zones—its high Shore hardness resists damage while staying bonded.
Scenario: Poor surface preparation on structural bonds
Potential Outcome: Reduced bond strength and long-term degradation.
Adheseal Best Practice: Clean, abrade where required, and prime correctly to lock in full structural performance.
Applications in Practice: Trade Scenarios
For Facade & Structural Installers: Panels and Curtain Walls
The Professional's Challenge
Structural elements demand strength without brittleness, especially where vibration and thermal movement are constant.
The Adheseal Solution
PU50FC delivers a high-strength flexible bond that holds under load while absorbing movement. Success means long-term structural confidence and clean inspections.
Best Practice Note
Control bead thickness and compression to maintain consistent bond performance.
For Public Infrastructure: Anti-Pick Sealing
The Professional's Challenge
Sealants in public spaces are exposed to impact, vandalism, and constant wear.
The Adheseal Solution
PU50FC’s high Shore hardness resists picking and abrasion while staying bonded. Success means fewer repairs and lower lifetime maintenance costs.
Best Practice Note
Tool neatly within skin time to maximise surface density and finish durability.
Frequently Asked Questions
What makes PU50 different from PU15 or PU25?
PU50FC is a high modulus polyurethane with much higher strength and hardness, making it suitable for structural bonding and anti-pick applications.
Is PU50 suitable for anti-pick applications?
Yes. With a Shore A hardness around 55, PU50FC is specifically suited for anti-pick sealing in schools, prisons, and public buildings.
Can PU50 be used below the waterline?
Yes. Once fully cured, PU50FC is suitable for below-waterline applications in marine and similar environments.
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.