Adheseal HV Duct Acrylic Sealant

Adheseal HV Duct is a high-strength acrylic HVAC duct sealant for high-velocity air ducts, sheet-metal seams, duct joints and dust extraction systems. It cures to form a flexible, paintable and dust-proof seal, making it a practical cartridge-applied duct sealing compound for air-conditioning, ventilation and metal fabrication work.

HV Duct is fire-tested to AS/NZS 1530.3, with a Spread of Flame Index of 0, Heat Evolved Index of 0 and Smoke Developed Index of 3. It is designed for sealing ductwork and metal joints rather than firestopping penetrations, so project fire-resistance requirements should be checked separately where an FRL-rated system is required.

Acrylic duct sealant for HVAC and air-conditioning ductwork

HV Duct is made for sealing around high-velocity air ducts and seams where a gunnable acrylic sealant is more practical than a brush-applied duct mastic. Typical applications include HVAC ductwork, air-conditioning ducts, sheet-metal seams, dust extraction systems and other metal fabrication joints.

It can also be used in bus and trailer body assembly, with polystyrene foam, at compatible Neoprene sponge foam tape interfaces and around aluminium window frames.

Why choose Adheseal HV Duct?

• High-velocity duct sealing: developed specifically for air ducts, duct seams and sheet-metal joints.
• Fire-tested to AS/NZS 1530.3: Ignitability Index 11, Spread of Flame Index 0, Heat Evolved Index 0 and Smoke Developed Index 3.
• Paintable acrylic finish: suitable where the completed joint needs to be overcoated.
• Flexible cured seal: accommodates approximately ±5% joint movement.
• Low VOC: 22 g/L.
• Water clean-up: uncured material and tools can be cleaned with water.
• Non-slump application: stays in place when gunned into duct seams and vertical joints.
• Service temperature: -5°C to +80°C after cure.
• Metal compatible: will not corrode galvanised or zinc-coated steel and is suitable for aluminium and metal substrates.

Where to use HV Duct sealant

• High-velocity HVAC ductwork
• Air-conditioning and ventilation ducts
• Sheet-metal duct seams and joints
• Metal sheets joined to ductwork or other compatible construction components
• Dust extraction ducting and systems
• Aluminium and other compatible metal fabrication
• Polystyrene foam applications
• Compatible Neoprene sponge foam tape interfaces
• Bus and trailer body assembly

HV Duct sealant or duct mastic?

Both products are used to seal duct joints, but the application method is different. HV Duct is a cartridge-applied acrylic duct sealant suited to seams, joints and smaller controlled beads. A brushable duct mastic such as Ductmate Proseal is better suited to coating wider assembled duct connections and is rated for low, medium and high-pressure metal duct systems up to 15 inches water gauge.

If you are searching for duct mastic, HVAC sealant or air duct sealant, choose according to the joint design, pressure requirements, application method and any required test or specification rather than the name alone.

Application

Surfaces must be structurally sound, stable, dry and clean, with dust, loose material, oil, grease, curing compounds and surface water removed. On impervious substrates, use a two-wipe cleaning process with a suitable cleaner such as 100% White Spirits. Test adhesion before full application.

Apply between 5°C and 35°C. Cut the nozzle at approximately 45 degrees and push a continuous bead ahead of the nozzle so the sealant makes good contact with both joint faces. Tool the joint promptly, ideally within about 5 minutes, and remove masking tape while the sealant is still wet.

HV Duct typically develops a skin in approximately 15 to 20 minutes at 25°C. Cure progresses at approximately 2 mm per day at 25°C and 50% relative humidity, with actual cure time affected by temperature, humidity, joint dimensions and substrate porosity.

Important limitations

• Do not apply below 5°C.
• Do not use where the sealant will be exposed to continuous water flow.
• Do not apply to wet or damp surfaces.
• Protect exterior applications from rain for up to three days after application.
• Do not use underwater, in swimming pools or below grade.
• Do not use in totally confined spaces where the product cannot dry and cure correctly.
• Do not use for structural glazing, mirror bonding or aquarium applications.
• Composite panels require compatibility testing before use.

For other duct sealing formats and HVAC joint sealants, compare the full HVAC Duct Sealants range.