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Use HV Duct for: Sealing high-velocity air ducts, seams, and metal sheets in HVAC systems, dust extraction, and general construction.
HV Duct High Velocity Duct Sealant is a premium, single-component acrylic sealant designed for professional use in HVAC and construction applications. Its fire-rated properties, confirmed by AS1530.3 certification, make it ideal for environments where safety is paramount. The sealant provides a durable, flexible seal, accommodating minor movements and ensuring long-term performance. With excellent adhesion to a variety of substrates, including metal, aluminium, and polystyrene foam, HV Duct offers a versatile solution for sealing and bonding in various industrial and commercial settings. Its low VOC formulation aligns with "Green Star" environmental criteria, making it a responsible choice for modern construction projects.
Key Features of HV Duct High Velocity Duct Sealant
- Fire-rated to AS1530.3, ensuring safety in critical applications.
- Excellent adhesion to metal, aluminium, and polystyrene foam.
- Paintable and flexible, maintaining a durable seal over time.
- Low VOC, meeting "Green Star" environmental standards.
- Inhibits mould and biological growth, ideal for humid environments.
Technical Overview
- Chemical Properties: Acrylic Polymer
- Application Temperature Range: 5°C to 35°C (41°F to 95°F)
- Service Temperature Range: -5°C to 80°C (23°F to 176°F)
- Movement Capability: ±5%
- Cure Speed: 4-48 Hours
- VOC Content: 22 g/L
Trade Professional Information
- Required Tools: Caulking gun, spatula, masking tape, cleaning cloths, solvent (e.g., 100% White Spirits).
- Trade-Specific Tips: Ensure surfaces are clean and dry before application. Use a two-wipe process for impervious substrates. For optimal adhesion, test and use appropriate primers (50A for non-porous, 2001 for porous).
- Common Issues and Solutions: Avoid application in wet or damp conditions. For confined spaces, ensure adequate ventilation. Clean uncured sealant with water.
Storage and Shelf Life
- Storage Requirements: Store in a cool, dry place between 5°C and 32°C (41°F and 89.6°F).
- Shelf Life Information: 24 months from the date of manufacture.
- Temperature Considerations: Avoid extreme temperatures to maintain product quality.
Certifications
- AS/NZ 1530.3 - 1999 (Smoke Developed Index 3)
Frequently Asked Questions About HV Duct High Velocity Duct Sealant
Q: Can I use HV Duct to seal around a kitchen exhaust duct that gets hot?
A: HV Duct has a service temperature up to 80°C. For standard kitchen exhaust ducts that operate within this range and where an acrylic fire-rated sealant is specified, it can be suitable. However, for commercial kitchen exhausts with very high temperatures or grease build-up potential, or where specific fire-stopping systems are mandated, you should consult the specific project requirements and potentially consider a higher temperature rated or intumescent fire sealant. Always ensure it meets local codes for such applications.
Q: How quickly can I paint over HV Duct after application?
A: While HV Duct skins over in 15-20 minutes, it's best to wait until it has substantially cured before painting. This typically means waiting at least 24-72 hours, depending on joint depth, temperature, and humidity. Full cure (2mm/day) is needed for best paint results. Painting too soon can trap moisture or affect the paint's adhesion or sealant cure. Always test on a small area first.
Q: Is HV Duct suitable for sealing joints in external ductwork exposed to direct sunlight and rain in Northern Queensland?
A: Yes, HV Duct is suitable for internal and external applications and is weatherproof with excellent ageing properties. It also resists mould. However, for external applications, especially in areas prone to heavy rain like NQL, it is critical to protect the applied sealant from rain for up to three days during its initial cure. Once fully cured, it will withstand typical weather conditions. Its UV resistance is good for an acrylic.
Q: What is the maximum joint width HV Duct can accommodate?
A: The TDS provides coverage for joints up to 25mm wide (e.g., 25x12mm). However, remember its movement capability is ±5%. For wider joints, ensure the anticipated movement is minimal. Using a backing rod is essential for wider joints to control sealant depth and ensure a 2-point adhesion for optimal (though limited) flexibility.
Q: My HV Duct seems thicker than usual in cold weather. What can I do?
A: Like most sealants, HV Duct will become more viscous (thicker) in cold temperatures. For easier gunnability, store cartridges at room temperature (around 20-25°C) for at least 24 hours before use if working in conditions near the lower application limit of 5°C. Do not attempt to heat the cartridge artificially as this can damage the product.
Applications Where HV Duct High Velocity Duct Sealant Excels:
- Sealing HVAC Ductwork Seams & Joints: Its primary design purpose. Perfect for creating airtight, fire-rated (AS1530.3 Smoke Index 3) seals in galvanised steel, aluminium, or other metal duct systems in commercial, industrial, and residential buildings across Australia.
- Air Conditioning System Sealing: Ideal for sealing around AC unit connections, plenums, and duct transitions where a durable, paintable, and mould-resistant seal is required to maintain system efficiency and air quality.
- Dust Extraction Systems: Effectively seals joints in dust extraction ducting, preventing leakage of fine particles and maintaining system suction, crucial in workshops and industrial settings in various Australian regions.
- Sealing Metal Sheet Assemblies: Useful for sealing laps and joints in fixed metal sheet constructions (e.g., some types of roofing/cladding details, internal partitions) where fire rating and weatherproofing (within its limits) are beneficial.
- Applications Involving Polystyrene Foam: Safely seals joints or bonds polystyrene foam to other compatible substrates without causing degradation, ideal for insulated ductwork or specific construction assemblies.
- Sealing Aluminium Window Frames (Low Movement): Provides a paintable, weatherproof seal around fixed aluminium window frames where minimal joint movement is anticipated and an acrylic sealant is specified.
Top Benefits of Using HV Duct High Velocity Duct Sealant on Your Projects:
- Achieve Critical Fire Safety Compliance: With its AS/NZS 1530.3 Smoke Developed Index of 3, HV Duct helps you meet stringent Australian building codes for HVAC and ductwork installations, enhancing safety and simplifying project approvals.
- Boost Application Efficiency & Ease: The ready-to-use, single-component formula, non-slump consistency, rapid skinning time, and easy water clean-up mean you can work faster, neater, and with less hassle, saving valuable time and labour costs on site.
- Promote Healthier Buildings & Meet Green Standards: Its low VOC content (22g/L) meets Green Star criteria, contributing to better indoor air quality. The mould and mildew resistance further supports healthier environments in Australian conditions.
- Versatile Adhesion & Paintability: Reliably bonds to a wide range of common HVAC and construction materials, including metals and polystyrene foam, and is fully paintable, allowing for seamless aesthetic finishes and reducing the need for multiple products.
- Durable, Long-Lasting Seals: Offers excellent ageing properties and weather resistance (when applied and cured correctly), providing durable, dust-proof, and flexible (±5%) seals that contribute to the longevity and efficiency of HVAC systems.
Step-by-Step Application Guide for HV Duct High Velocity Duct Sealant:
- Preparation is Paramount: Ensure all joint surfaces are structurally sound, clean, completely dry, and free from dust, grease, oil, old sealant, or any loose materials. Use the two-wipe method with 100% White Spirits for impervious substrates. For porous substrates, ensure they are dust-free and stable. Conduct an adhesion test. If priming is required, apply Adheseal Primer 50A (non-porous) or 2001 (porous) as per TDS and allow to dry. Avoid application if surface temperature is below 5°C or above 40°C, or if rain is imminent for external work (protect for up to 3 days).
- Nozzle & Gun Setup: Cut the tip of the 300ml cartridge threaded nipple. Screw on the nozzle and cut it at a 45° angle to your desired bead size (e.g., slightly wider than the joint). Ensure the opening is clean. Insert the cartridge into a quality caulking gun like the Adheseal ProGun HD.
- Application Technique: Hold the caulking gun at a 45° angle with the nozzle tip in contact with both sides of the joint. Apply by PUSHING the sealant bead ahead of the nozzle into the joint, ensuring a steady, continuous flow. This technique forces the sealant into the joint, ensuring good wetting and contact with the substrates for optimal adhesion.
- Tooling for a Professional Finish: Tool the sealant within approximately 5-10 minutes of application, before it skins. Use a wetted (water or very mild detergent solution) spatula, specialised tooling aid, or a wetted finger. Apply light, consistent pressure to compact the sealant into the joint, ensure full contact, remove any air pockets, and achieve a smooth, neat concave finish. Proper tooling is crucial for aesthetics and performance. If you've used masking tape for sharper edges, remove it immediately after tooling, pulling away from the joint.
- Clean-Up: While HV Duct is still wet (uncured), tools and any spills can be cleaned easily with water and a cloth. If sealant has started to cure, it becomes more difficult. Cured sealant typically needs to be removed by mechanical means (e.g., scraping, cutting) carefully to avoid damaging substrates.
- Curing Process: Allow HV Duct to cure fully. It skins in 15-20 minutes and cures at approximately 2mm depth per 24 hours at 25°C/50% RH. Full cure may take 4-48 hours or longer depending on conditions and joint depth. Avoid disturbing, stressing, or painting the joint until adequately cured. Remember, it requires atmospheric humidity to cure and will not cure in totally confined spaces.
- Pro Tip for External Applications: In Australia's varied climate, if applying externally, check the weather forecast. Do not apply if rain is likely within the next 24-72 hours as this can wash out or affect the surface of the uncured acrylic sealant. Protect freshly sealed joints from rain.
Important Limitations & Safety When Using HV Duct High Velocity Duct Sealant:
Product Limitations:
- Not for Continuous Water Immersion or Flow: HV Duct is not suitable for applications like swimming pools, aquariums, or areas with constant water contact. For such uses, consider a specialised Adheseal waterproof sealant. This is because acrylics can soften or degrade with prolonged immersion.
- Not for Below Grade Applications: Do not use HV Duct for sealing joints below ground level, as these areas are often subject to hydrostatic pressure and constant dampness for which it's not designed.
- Low Movement Capability (±5%): Only suitable for joints with very minimal expected movement. Not for dynamic structural joints, expansion joints experiencing significant thermal cycling, or high vibration areas. Using it in high-movement joints will likely lead to sealant failure. Consider Adheseal HiFlex 60 or similar for higher movement.
- Application Temperature & Conditions: Do not apply below 5°C or above 40°C. Do not apply in wet or damp conditions. External applications must be protected from rain for up to three days during cure. It needs atmospheric humidity to cure and will not cure in totally confined spaces.
- Not for Structural Glazing: For structural glazing applications, use a dedicated product like Adheseal N-80 or N-60 Glazing Silicone. HV Duct is not designed for the structural loads involved.
- Not for Adhering Mirrors: HV Duct is not recommended for adhering mirrors. Test Adheseal High Power 609 for this purpose.
- Not for Composite Panels (where high flexibility needed): For composite panels that may experience significant differential movement, HV Duct's ±5% capability is likely insufficient. Adheseal recommends Hi Flex 60 (subject to testing first).
- Aquariums: Specifically listed as not suitable.
Safety First – Protecting Yourself and Your Workspace:
- Personal Protective Equipment (PPE): Always wear safety glasses with side shields (compliant with AS/NZS 1337.1) to prevent eye contact. Wear chemical-resistant gloves, such as nitrile rubber (compliant with AS/NZS 2161), especially during prolonged use. Consider long-sleeved clothing to minimise skin contact.
- Ventilation: Ensure adequate ventilation when using HV Duct indoors. Open windows and doors to promote fresh air flow. For large-scale indoor applications or in confined spaces where vapour might build up, mechanical extraction may be necessary, meeting AS/NZS guidelines.
- Safe Handling Practices: Avoid contact with skin and eyes. Do not eat, drink, or smoke while using the product. Wash hands thoroughly with soap and water after handling and before breaks or meals.
- First Aid Essentials: Skin: If contact occurs, wash skin with soap and water and rinse thoroughly. Eyes: If sealant enters eyes, rinse opened eye for several minutes under running water. Then consult a doctor. Inhalation: If vapours cause discomfort, remove person to fresh air and keep comfortable for breathing. Ingestion: Do not induce vomiting; call for medical help immediately. Always refer to the Safety Data Sheet (SDS) for HV Duct for complete first aid information and keep the Poisons Information Centre number handy (Australia: 131 126).
- Storage & Spill Management: Store out of reach of children. In case of a spill of uncured sealant, contain it and clean up with absorbent material, then place in a suitable container for disposal according to local regulations.
HV Duct High Velocity Duct Sealant Adhesion Profile – Compatible Substrates:
- Aluminium (Mill Finish & Powder Coated): Ensure surfaces are clean, dry, and free of oxidation or processing oils. For mill finish, a light abrasion followed by solvent wipe (White Spirits via two-wipe method) can enhance adhesion. For powder-coated surfaces, ensure coating is well-adhered and clean. Primer 50A may be beneficial after testing.
- Galvanised Steel & Zinc Coated Steel: Must be thoroughly cleaned to remove any passivation oils or white rust. Use the two-wipe process with White Spirits. HV Duct is non-corrosive to these surfaces. Primer 50A can be tested for maximum adhesion in critical areas.
- Other Metals (e.g., Mild Steel, Stainless Steel): Clean thoroughly to remove any rust, scale, or oils. A solvent wipe is essential. For mild steel, ensure it's adequately protected from corrosion before sealing if exposed. Test adhesion; Primer 50A may be required.
- Polystyrene Foam (EPS, XPS): HV Duct is an excellent choice as it does not attack or dissolve polystyrene foam. Ensure foam is clean and dust-free. Direct application is usually successful.
- Concrete & Masonry (e.g., brickwork, render): Surfaces must be sound, dry, and free of dust, laitance or curing compounds. Porous surfaces generally require Adheseal Primer 2001 for optimal, durable adhesion. Allow primer to dry before applying sealant.
- Timber (Painted or Bare): Ensure timber is dry and sound. Painted timber should have well-adhered paint. For bare timber, especially porous types, Adheseal Primer 2001 is recommended after testing. HV Duct is paintable to match timber finishes.
- Plasterboard: Ensure surface is clean, dry, and dust-free. If sealing to the paper face, direct application is usually fine. If sealing to cut edges, sealing the edge with a diluted PVA or primer can prevent excessive moisture absorption from the sealant. Test first.
- Neoprene Sponge Foam Tapes: HV Duct is stated as compatible. Ensure tape is clean and well-adhered to its primary substrate before sealing against it.
- Pro Tip: An adhesion test on actual site materials is ALWAYS recommended for critical applications to ensure compatibility and determine if priming is necessary. Contact Adheseal for their B.A.T. (Bond Adhesion Testing) Program for project-specific testing.
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