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Ensure conditioned air stays where it belongs, sealed tightly within high-velocity ductwork and metal seams. Prevent energy loss and meet critical fire safety standards in one application. This is a sealant built for the demands of HVAC systems and sheet metal fabrication, offering a permanent, flexible seal with proven fire resistance. Rely on system integrity, not costly reworks.
HV Duct is an acrylic polymer sealant engineered for fire-rated sealing in high-velocity HVAC systems and metal assemblies. It delivers a permanently elastic seal (with ±5% joint movement) that meets stringent fire safety requirements (AS1530.3, Smoke Developed Index 3). Its acrylic base ensures water clean-up, low VOC content, and compatibility with sensitive materials like polystyrene foam and neoprene tapes. This formulation provides a safer and easier-to-use option for sealing metal seams, duct-to-metal joints, and other fabrication work where fire compliance and durable flexibility are non-negotiable.
The AS1530.3 Smoke Developed Index of 3 is a critical safety measure. This low rating confirms minimal smoke generation in a fire event, crucial for occupant evacuation and building safety compliance. It provides essential peace of mind in confined spaces like ducting. A joint movement capability of ±5% accommodates the thermal expansion and contraction common in metal ductwork and panels. This prevents cracking and maintains seal integrity through temperature fluctuations, avoiding air leakage and energy inefficiency. With a VOC content of just 22gm/lt, HV Duct meets Green Star environmental criteria. This ensures healthier indoor air quality and a safer working environment during and after application.
Prepare surfaces to be structurally sound, dry, and clean, free from dust, oils, and other contaminants. For impervious substrates, use a two-wipe process with 100% White Spirits. If testing indicates a need for enhanced adhesion, prime porous surfaces with Everflex Supaprime Sealant Primer or non-porous surfaces with Adheseal 50A Surface Prep. Apply HV Duct between 5°C and 40°C. For sealing, cut the nozzle to a 45° angle, ensuring a continuous bead that contacts both joint sides. For adhesive applications, cut the nozzle to create a triangular bead, then compress the surfaces together. Tool off with a moistened spatula within approximately 5 minutes, and clean any excess with water before the sealant skins over. The sealant skins in 15-20 minutes and cures at approximately 2mm per day.
HV Duct typically serves as the critical final sealing component in HVAC and metal fabrication systems. It completes the assembly by providing an airtight and fire-rated barrier. Before application, consider integrating a compatible Adheseal backer rod to control sealant depth and prevent three-sided adhesion, optimising the seal's performance and lifespan. For specific substrate conditions, pre-test adhesion and use appropriate Adheseal primers like Everflex Supaprime or Adheseal 50A Surface Prep for reliable long-term bonding.
HV Duct is fire tested to AS1530.3, achieving a Smoke Developed Index of 3. This standard confirms its performance in fire conditions for high velocity ductwork and HVAC systems.
HV Duct is specifically designed for high velocity air ducts and metal seams, offering non-corrosive properties for galvanised and zinc-coated steel. It is also compatible with aluminium and polystyrene foam.
No, HV Duct is not suitable for continuous water flow, underwater applications, or below-grade use. For external applications, protect the applied sealant from rain for up to three days.
Adhesion testing is recommended, especially for critical applications. If priming is necessary, use Adheseal Primer 50A for non-porous surfaces and Adheseal Primer 2001 for porous substrates.
| Application | Key benefit | Primary trades |
|---|---|---|
| Sealing high velocity air ducts and HVAC systems | Fire tested to AS1530.3 (Smoke Developed Index 3) for certified safety and compliance. | HVAC installers, Sheet metal fabricators |
| Sealing metal seams and joints | Non-corrosive to galvanised/zinc-coated steel, preventing premature system failure. | HVAC installers, Commercial builders |
| Flexible gasket formation in various industries | ±5% movement capability maintains seal integrity under dynamic conditions. | Mechanical engineers, Vehicle body builders |
| Sealing around aluminium window frames | Excellent adhesion to common construction materials like aluminium. | Aluminium fabricators, Glaziers |
| Use with polystyrene foam and Neoprene sponge tapes | Proven compatibility without attacking sensitive substrates. | Insulation installers, HVAC manufacturers |
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.
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.
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.
Warning: This material is hazardous according to Safe Work Australia GHS 7 criteria.
Wear Nitrile Rubber gloves, apron, safety glasses (with side shields), and an organic vapour/particulate respirator meeting AS/NZS 1715 and AS/NZS 1716 requirements if inhalation risk exists. Ensure adequate ventilation.
Use in well-ventilated areas. Ensure ventilation is adequate to maintain air concentrations below exposure standards. Avoid generating and inhaling dusts.
Store in a cool, dry, well-ventilated place, out of direct sunlight, between 5°C and 32°C. Keep containers upright and closed when not in use. This material is a Scheduled Poison (Schedule 5) and must be stored according to relevant regulations. Dispose of waste in accordance with local regulations; do not allow product to reach groundwater or sewage systems.
Proper surface preparation ensures optimal adhesion and sealant performance, especially in critical ducting and HVAC installations.
Surface prep: Surfaces must be sound, stable, dry, and clean. Remove all dust, loose material, oils, grease, and contamination. For impervious metals, use the two-wipe process with 100% White Spirits, changing cloths frequently. Ensure no surface water or dampness.
Primer: Optional. Test for adhesion first. If required, use Adheseal Primer 50A for non-porous metals. Apply with a small brush and allow solvent to evaporate for several minutes.
Surface prep: Ensure the foam is clean, dry, and free from any contaminants. It must be structurally sound and stable.
Primer: Not required. HV Duct is compatible with polystyrene foam without priming.
| Property | Value |
|---|---|
| Type of Product | Acrylic Polymer |
| Curing System | Moisture Loss |
| Density (specific gravity) | 1.5 |
| Consistency | Paste |
| Clean Up | Water |
| Application Temperature | 5°C – 35°C |
| Storage: Cool Dry between | 5°C – 32°C |
| Service Temperature | -5°C – 80°C |
| Movement Capability | ±5% |
| Tack Free (@25°C) | 15-20 min |
| Chemical Resistance | Excellent to water, detergent solutions, diluted acids & alkalies and oil for short periods |
| Ignitability Index AS1530.3 | 11 |
| Spread of Flam Index AS1530.3 | 0 |
| Heat Evolved Index AS1530.3 | 0 |
| Smoke Developed Index AS1530.3 | 3 |
| Cure Speed | 4 – 48 Hours |
| Shelf Life | 24 Months |
| VOC (Californian South Coast Air Quality Management Rule 1168) | 22 gm/lt |
| Colour | Grey |
| Test certificates to AS | AS/NZ 1530.3 –1999 |
Here are some common examples on where Adheseal HV Duct used by our customers.
