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For high-velocity air ducts, seams, and metal sheet joints where fire rating and draft control are required, Adheseal HV Duct Acrylic Sealant provides a high-strength, dust-proof barrier. Tested to AS/NZS 1530.3, it achieves a Smoke Developed Index of 3, helping HVAC installations comply with fire safety standards while preventing air leakage in high-pressure systems.
HV Duct is a single-component acrylic polymer that cures through moisture loss. Once applied, it forms a permanently elastic gasket that absorbs vibration and accommodates up to ±5% joint movement. In hot and humid environments, the cured sealant resists mould, mildew, and biological growth. The formulation is low-VOC (22 g/L) to meet Green Star environmental criteria, completely odourless once cured, and will not corrode galvanised steel, zinc-coated steel, or concrete.
HV Duct is suitable for both internal and external applications. It has excellent adhesion to metal, aluminium, and polystyrene foam without causing degradation. Common applications include:
Do not use HV Duct in the following scenarios:
All surfaces must be structurally sound, dry, clean, and free of dust, grease, curing compounds, or surface water. For non-porous substrates, clean using the two-wipe process with 100% White Spirits. Adhesion testing is recommended. Where a primer is required, use Adheseal 50A for non-porous substrates and Adheseal 2001 for porous substrates.
When applying as a sealant, cut the nozzle at a 45° angle and apply in a continuous bead, pushing the sealant ahead of the nozzle to ensure contact with both joint faces. When applying as an adhesive to bond two surfaces, cut a wedge in the nozzle to dispense a triangular bead, then compress the assembly to a minimum thickness of 2mm.
Tool the joint with a moistened spatula within 5 minutes of application, before the skin forms. Remove masking tape while the sealant is still wet. Incompatible substrates may cause discolouration or premature degradation; always conduct a compatibility test before full application.
Clean tools and wet spills immediately with water. Cured sealant cannot be dissolved and must be removed by mechanical means.
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 Acrylic Sealant used by our customers.
