Price Per Unit: $4.58
Price Per Box: $4.12
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.
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.