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Unobond: A Product Overview
Adheseal Unobond is a no-nonsense, single-pack polyurethane adhesive engineered for when the job demands a structural-grade bond you can stand behind. It’s a moisture-curing system that sets fast, eliminating downtime and guesswork. Once cured, Unobond achieves a D4 classification for water resistance, making it a reliable solution for everything from marine fit-outs to exterior joinery. Its real strength lies in its versatility—it tenaciously bonds a huge range of common building materials, including timber, metals, concrete, and fibrous cement, provided one surface has moisture to kick off the cure. It’s the go-to adhesive for professionals who need certainty and performance, without the hassle of mixing.
Core Features & Specifications
- Structural Bond Strength: Cures to form a high-strength, structural bond with a tensile strength of 5 N/mm², ensuring your work withstands the test of time.
- D4 Water Resistance: Achieves a D4 classification, making it suitable for marine environments, exterior woodwork, and areas with high moisture exposure.
- Fast Setting Formula: With a skin time of just 10 minutes and a 60-minute clamp time, it helps you move onto the next stage of the job faster, increasing site efficiency.
- Paintable Surface: Fully compatible with acrylic, oil, and rubber-based paints, allowing for a seamless, professional finish on any project.
- Low VOC Compliance: With a VOC content of less than 1%, it meets "Green Star" environmental criteria, making it a responsible choice for modern job sites.
The Unobond Advantage
- No Mixing Required: As a single-pack product, it’s ready to use straight from the cartridge, saving valuable time and eliminating mixing errors on site.
- Extreme Versatility: Bonds porous to non-porous substrates, including timber, metal, concrete, and foam, reducing the need to carry multiple adhesives.
- Wide Service Temperature: Performs reliably in a service temperature range of -30°C to +100°C, ensuring long-term durability in harsh Australian conditions.
- Non-Corrosive Formula: Safe to use on metals, including galvanised and zinc-coated steel, without causing corrosion or attacking concrete substrates.
Applications in Practice: Trade Scenarios
For Carpenters & Joiners: High-Strength Cabinet Assembly
The Professional's Challenge
Assembling custom cabinets and furniture requires a bond that's stronger than the timber itself. You need an adhesive that ensures tight, permanent joints without fail, especially for high-use items or exterior applications where moisture is a risk.
The Adheseal Solution
Apply a thin bead of Unobond to one surface, ensuring the glue line will be between 0.1mm and 0.25mm. Its slight expansion fills minor irregularities for a solid connection. Clamp the joint tightly (approx. 50 PSI for softwoods, 150 PSI for hardwoods) for at least 60 minutes. The result is a structural, D4-rated bond that provides absolute certainty.
Best Practice Note
Don't try to wipe away wet 'squeeze-out'. Let it cure completely, then remove it cleanly with a sharp blade. This prevents smearing the adhesive across the timber face, saving you cleanup time and delivering a perfect finish.
For Builders & Installers: Fixing Skirting Boards to Multiple Surfaces
The Professional's Challenge
Fixing timber skirting boards across different wall types like plasterboard, brick, and concrete can be a hassle. You need a single adhesive that reliably bonds wood to both porous and non-porous substrates without needing different products for each wall.
The Adheseal Solution
For plasterboard and timber frames, the moisture content is sufficient for a strong cure. When bonding to dry concrete or brick, lightly mist the masonry surface with water before applying the skirting board. This provides the moisture needed for Unobond to cure into a tenacious, permanent bond. Use nails or bracing to apply pressure while it sets.
Best Practice Note
To stop floor squeaks, apply a bead of Unobond into the groove of each floor panel before mating it with the next. The controlled expansion of the adhesive will take up any voids, creating a solid, silent floor you can guarantee.
Frequently Asked Questions
How long do I need to clamp a joint bonded with Unobond?
Joints should be clamped for a minimum of 60 minutes at 23°C and 50% relative humidity. Ensure you apply enough pressure to bring the surfaces tightly together, with recommended pressures of 50 PSI for softwoods and 150 PSI for hardwoods. This pressure is critical for achieving maximum bond strength.
Can I use Unobond to fill gaps in timber?
No, Unobond is a structural adhesive, not a gap filler. It is designed for close-fitting joints with a maximum glue line of 0.5mm. Using it as a gap filler will significantly reduce the final bond strength. For filling cracks and gaps, a dedicated product like Adheseal GapFilla should be used.
Does Unobond work on non-porous materials like metal?
Yes, Unobond bonds exceptionally well to metals like steel and aluminium. However, it is a moisture-curing adhesive. For a bond between two non-porous surfaces (e.g., metal to plastic), you must lightly spray mist one surface with water after applying the adhesive to provide the moisture needed for the chemical cure to occur.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Furniture & Cabinet Manufacturing | Provides a rigid, structural bond stronger than the wood itself, with excellent water resistance for wet areas. | Carpenters, Joiners, Cabinet Makers |
| Exterior Woodwork & Joinery | D4 water resistance ensures the bond will not fail due to weather exposure, providing long-term durability. | Builders, Carpenters, Landscapers |
| Fixing Mouldings & Skirting Boards | Bonds timber to multiple substrates including plasterboard, concrete, and brick, simplifying installation. | Builders, Carpenters, Installers |
| Marine & Vehicular Manufacturing | Creates a high-strength, water-resistant, and vibration-resistant bond suitable for demanding transport applications. | Boat Builders, Vehicle Body Builders |
| General Construction Adhesive | Versatile adhesion to most common building materials including metals, FC sheeting, and foam insulation. | Builders, General Contractors |
Applying Unobond: Professional Protocol
-
Surface Preparation
Proper prep is non-negotiable for a structural bond. Ensure all substrates are clean, dry, structurally sound, and free of any contaminants like dust, oil, or grease that could compromise adhesion.
Porous Surfaces (Timber, Concrete)
Ensure surfaces are free from dust and loose material. Concrete must be cured for a minimum of 28 days. At least one surface must have a moisture content of 8% or more.
Non-Porous Surfaces (Metals, Plastics)
Lightly sand the surface to create a profile, then wipe clean with Adheseal Xylene using a two-wipe process with clean cloths.
Pro Tip: Unobond requires moisture to cure. For very dry substrates or in low humidity, a light mist of water sprayed onto the surface opposite the adhesive will guarantee a fast, reliable cure. -
Application & Clamping
Apply adhesive to one of the surfaces to be bonded. Join the substrates immediately and apply firm, even pressure to produce a final glue line between 0.1mm and 0.25mm thick.
Applying the Bead
Cut the nozzle at a 45° angle. Apply a consistent bead approximately 10mm in from the edge to minimise squeeze-out. Tool off with a spatula to ensure even coverage before the 10-minute skin time.
Clamping Protocol
Use clamps, screws, or nails to apply pressure. Clamp for at least 60 minutes. Use ~50 PSI for softwoods and ~150 PSI for hardwoods. This pressure is essential for maximum bond strength.
Pro Tip: Leave any adhesive squeeze-out to cure fully. Once dry, it can be removed easily and cleanly with a sharp chisel or blade without smearing, ensuring a professional finish.
Limitations & Safety
Product Limitations
Not a Gap Filler: Unobond is a structural adhesive designed for close-fitting joints (max 0.5mm). Using it in wide gaps will compromise bond strength. For filling, use a dedicated product like Adheseal GapFilla.
Pressure Required: Maximum bond strength is only achieved when consistent pressure is applied during the initial 60-minute cure using clamps, screws, or nails.
Moisture is Essential: The product will not cure in a totally confined space without access to atmospheric humidity or substrate moisture. One of the surfaces must contain moisture.
Not for Structural Glazing: Do not use for structural glazing applications. Use a dedicated glazing silicone like Adheseal N-60 or N-80.
Safety & Handling Requirements
Personal Protective Equipment
Wear protective overalls, safety glasses, and chemical-resistant gloves (e.g., Nitrile Rubber). Avoid all direct skin and eye contact. Wash hands thoroughly after handling and before eating or drinking.
Ventilation Requirements
Use only in well-ventilated areas. If inhalation risk exists due to poor ventilation, an organic vapour/particulate respirator meeting AS/NZS 1715 & 1716 standards is required. May cause respiratory irritation and allergic reactions upon inhalation.
Emergency First Aid
Eyes:
Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing and consult a doctor.
Skin:
Immediately wash affected area with plenty of soap and water. If skin irritation or an allergic reaction occurs, seek medical advice.
Inhaled:
Remove person to fresh air and keep comfortable for breathing. If you feel unwell or symptoms persist, seek medical attention.
Swallowed:
Do NOT induce vomiting. Call for medical help immediately.
For all poisoning concerns, contact the Poisons Information Centre (Australia: 131 126).
Substrate & Preparation Guide
Timber (Softwoods & Hardwoods)
Surface Preparation
Ensure timber is clean, dry, and free from dust, oils, or any surface contaminants. The surface must be structurally sound. For optimal results, one of the surfaces should have a moisture content of at least 8% to initiate the cure.
Primer Requirements
No primer typically required
Unobond is designed for direct application to prepared timber surfaces. No primer is necessary for achieving a structural bond.
Metals (Aluminium, Steel, Sheet Metal)
Surface Preparation
Surfaces must be clean, dry, and free from oils, grease, or oxidation. Lightly sand the metal surface to create a mechanical key, then perform a two-wipe process using a clean, lint-free cloth and a suitable solvent like Adheseal Xylene.
Primer Requirements
No primer typically required
Proper surface cleaning and abrasion are sufficient for excellent adhesion to most common metals. If bonding metal to another non-porous surface, a light mist of water is required on one face to ensure cure.
Cementitious (Concrete, Brick, FC Sheeting)
Surface Preparation
All surfaces must be structurally sound, stable, and clean. Remove any dust, loose material, form release agents, or curing compounds. New concrete must be allowed to cure for at least 28 days. The surface must not have continual dampness.
Primer Requirements
No primer typically required
The inherent porosity and moisture content of cured cementitious materials are typically sufficient for Unobond to achieve a full cure and strong bond.
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