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HV Duct Sealant: A Product Overview
For HVAC professionals, achieving an airtight and compliant seal is non-negotiable. Adheseal HV Duct is a high-strength, water-based acrylic sealant specifically engineered for the demands of high-velocity air ducting. It forms a permanently flexible gasket that eliminates air leaks from connecting flanges and seams, ensuring the system operates at peak efficiency and preventing costly pressure loss. Its non-slump formula is easy to tool, paintable for a clean finish, and provides excellent adhesion to metals and polystyrene foam. Crucially, it's fire-tested to AS/NZS 1530.3, giving you the certainty you need to meet stringent building code requirements.
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Smoke Developed Index (AS/NZS 1530.3). A critical, low rating for fire safety compliance in commercial and residential HVAC systems.
Core Features & Specifications
- Fire Rated Compliance: Fully tested to AS/NZS 1530.3 with a low Smoke Developed Index of 3, essential for meeting project specifications.
- Permanent Flexibility: Maintains a flexible seal with ±5% movement capability, absorbing vibration and thermal changes in ductwork without cracking.
- Airtight Seal: Creates a robust, dust-proof and weatherproof seal on flanges and seams to prevent energy-wasting air leaks and pressure drops.
- Excellent Adhesion: Bonds securely to galvanized steel, aluminium, and other common duct materials, including polystyrene foam and neoprene tapes.
- Non-Corrosive Formula: Will not corrode galvanized or zinc-coated steel, protecting the integrity of the ductwork for the long term.
The HV Duct Sealant Advantage
- Guarantee System Performance: Eliminate leaks to ensure the HVAC system delivers the specified airflow, reducing energy consumption and improving occupant comfort.
- Specify with Confidence: Provide engineers and inspectors with certified fire test data (AS/NZS 1530.3) that meets Australian building standards.
- Improve Installation Speed: A ready-to-use, single-pack sealant with rapid skinning and easy water clean-up helps you finish jobs faster.
- Deliver a Lasting Job: The durable, mould-resistant formula won't shrink or crack, preventing callbacks and ensuring the integrity of your installation for years.
Applications in Practice: Trade Scenarios
For HVAC Installers: Sealing Duct Flanges
The Professional's Challenge
Ensuring every flange connection is perfectly airtight is critical. Even minor leaks lead to significant pressure loss, forcing the system to work harder, increasing running costs, and potentially causing noise complaints.
The Adheseal Solution
Apply a continuous bead of HV Duct Sealant to one flange surface before joining. Its high-grab, non-slump consistency holds it in place. Once bolted, the sealant forms a perfect, flexible gasket that eliminates leaks and withstands system vibration.
Best Practice Note
For a perfect external fillet seal after joining, tool the sealant within 15-20 minutes of application. This ensures a smooth, professional finish that is ready for painting if required.
For Specifiers & Engineers: Fire Safety Compliance
The Professional's Challenge
Specifying materials for air handling systems requires absolute certainty on fire performance to comply with the National Construction Code (NCC) and prevent the spread of smoke in an emergency.
The Adheseal Solution
HV Duct Sealant is rigorously tested to AS/NZS 1530.3. With a Spread of Flame Index of 0, Heat Evolved Index of 0, and a low Smoke Developed Index of 3, it meets the stringent requirements for materials used in plenums and air-handling ducts.
Best Practice Note
The full AWTA test report (19-001488) is available for inclusion in project documentation, providing traceable evidence of compliance for inspectors and building certifiers.
Frequently Asked Questions
Is Adheseal HV Duct Sealer properly fire rated for commercial use?
Yes. It has been independently tested in Australia to AS/NZS 1530.3-1999. It achieved a Spread of Flame Index of 0 and a low Smoke Developed Index of 3, making it suitable for specification on commercial and residential HVAC projects.
How long does HV Duct Sealer take to cure before a system can be run?
HV Duct skins over in 15-20 minutes and cures at approximately 2mm per day. For full performance, a 24-48 hour cure is recommended, but low-pressure system testing can often begin sooner depending on temperature and humidity.
Can this sealant be used on PVC or flexible plastic ducting?
Adheseal HV Duct is specifically formulated and tested for excellent adhesion to metal ductwork (galvanized steel, aluminium) and polystyrene foam. It is not recommended for use on PVC or other plastics without conducting a thorough adhesion test first.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Sealing High-Velocity Duct Flanges & Seams | Forms a permanent, flexible, airtight gasket to prevent pressure loss and ensure system efficiency. | HVAC Installers, Sheet Metal Workers |
| Air Conditioning & Duct Work Installations | Fire-rated (AS/NZS 1530.3) with a low smoke index, ensuring compliance with building codes. | Mechanical Contractors, HVAC Engineers |
| Dust Extraction Systems | Creates a durable, dust-proof seal that withstands vibration and maintains system suction. | Industrial Installers, Maintenance Teams |
| Sealing around Polystyrene Insulation | Water-based formula is compatible with and will not attack polystyrene foam insulation panels. | HVAC Installers, Insulators |
Applying HV Duct: Protocols & Best Practices
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Surface Preparation
Ensure all flange and seam surfaces are structurally sound, dry, and meticulously clean. Remove all traces of oil, grease, dust, and any other contaminants that could hinder adhesion.
Pro Tip: Use the two-wipe solvent cleaning method for all metal surfaces. Wipe on with one clean cloth to dissolve contaminants, and wipe off immediately with a second clean cloth before the solvent flashes off. -
Application Method
Cut the nozzle at a 45° angle to your desired bead size. Using a professional caulking gun, apply a continuous, steady bead, pushing the sealant ahead of the nozzle to ensure it is forced firmly into the joint for full contact.
Temperature: Apply only when the substrate and ambient temperature is between 5°C and 35°C. Do not apply in wet or damp conditions. -
Tooling and Clean-up
Tool the sealant with a moistened spatula within 15-20 minutes to achieve a smooth, professional finish. Any excess uncured sealant can be cleaned up immediately with water.
Pro Tip: For external applications, ensure the sealant is protected from rain for up to three days to allow for proper curing and skin formation.
Limitations & Safety
Product Limitations
Not suitable for applications involving continuous water immersion or flow (e.g., pools, aquariums).
Not intended for use as a structural glazing adhesive.
Do not apply in totally confined spaces as the sealant requires atmospheric moisture to cure.
Avoid application in wet/damp conditions or at temperatures below 5°C.
Safety & Handling Requirements
Personal Protective Equipment
Always wear safety glasses and protective gloves. Nitrile rubber gloves are recommended. In areas with poor ventilation, a suitable respirator (AS/NZS 1715/1716) is required.
Emergency First Aid
Eyes:
Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.
Skin:
Wash affected area with plenty of soap and water. If irritation or a rash occurs, seek medical attention.
Inhaled:
Remove person to fresh air and keep comfortable for breathing. If symptoms persist, call a doctor.
Swallowed:
DO NOT induce vomiting. Immediately call a Poisons Information Centre (131 126) or a doctor.
Adhesion & Substrate Preparation
Galvanized Steel & Aluminium
Surface Preparation
All metal surfaces must be clean, dry, and free from manufacturing oils, grease, and dust. Use a two-wipe process with a suitable solvent like 100% White Spirits on a clean, lint-free cloth for best results.
Primer Requirements
No primer typically required
Excellent adhesion is achieved on clean, prepared metal surfaces without a primer. Always conduct a site adhesion test for critical applications.
Polystyrene Foam & Neoprene Tapes
Surface Preparation
Ensure foam surfaces and tapes are clean, dry, and firmly bonded. Remove any dust or loose particles before applying the sealant to ensure direct contact and a secure bond.
Primer Requirements
No primer required
HV Duct is fully compatible and will not attack polystyrene foam. It can be used to seal joints and gaps where foam insulation is present.
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