
Acoustic Sealant 310ml & 900ml
£3.95 – £7.95 ex. VAT
Estimated Delivery: 2 Days
(24th Jul)
Acoustic sealant is a flexible, airtight resin used to maintain acoustic integrity in soundproofing systems and fill in spaces around plasterboard walls and ceilings to reduce noise. It fills gaps, cracks, edges, and panel perimeters to prevent sound leakage through walls and ceilings.
Our acoustic sealant is supplied in two tube sizes: 310ml (standard) and 900ml (large). The 900ml tube requires a jumbo sealant applicator. One 310ml tube is typically enough to acoustically seal around five 1200mm x 1200mm soundproof panels (1.44sqm each).
Soundproofing: Walls and ceilings
Application areas: Panel edges, gaps, cracks, joints
Seal type: Airtight and flexible
Sizes available: 310ml (standard), 900ml (jumbo)
Tools required: Standard or jumbo sealant gun, depending on size
Installation: DIY friendly
Flexible, Airtight Sealant for Acoustic Panels – Ideal for Walls and Ceilings
Acoustic sealant is vital tool in reducing noise. This high-strength, permanently flexible mastic (a type of resin) is designed to maintain airtightness and prevent sound leakage when soundproofing plasterboard walls and ceilings.
Specially formulated for use around the edges and perimeters of walls, ceilings and soundproofing panels, it ensures long-lasting acoustic integrity – and calmer, more peaceful rooms.
Benefits
- Permanently flexible for long-lasting performance
- High initial grab for secure application
- Bonds to most common building surfaces
- Mould resistant for added durability
- Non-flammable and fire-rated for safety
- Overpaintable for a clean, seamless finish
- Easy to clean up during installation
Areas for Use
Use this high-strength acoustic sealant to create an effective sound barrier by sealing gaps between plasterboard walls, floors, and ceilings. It is also ideal for dry lining applications and suitable for both domestic and commercial soundproofing projects.
Limitations
- Damp or humid conditions will significantly extend cure time
- Do not abrade the product once cured
- Do not overpaint until fully cured (typically 24 hours, or 4–5 days in cold, damp, or humid conditions)
- Do not apply in temperatures below 5°C
- For overhead boarding, always use in conjunction with mechanical fixings
Surface Preparation
- Ensure all surfaces are clean, dry, and free from dust
- Remove any loose or flaking coatings, old sealant, or mastic joints before application
- Prime highly porous surfaces (e.g. new plaster) with a PVA bond diluted 1:4 with water
- Surfaces can be slightly damp but must not be wet
- Note: Damp surfaces will significantly slow the curing process
Application:
This dual-action sealant and adhesive is easy to self-apply.
For 310ml tubes:
- Cut the cartridge tip carefully without damaging the thread
- Attach the nozzle and cut it cleanly at a 45° angle
For 900ml tubes:
- Insert the cartridge into a jumbo sealant applicator
- Cut the nozzle to the desired length
- Puncture the inner membrane seal before use
Use as a sealant:
Always cut the nozzle to size slightly larger than the gap to be sealed. Apply to the gap, slightly overfilling and finish smooth with a caulking tool or filler knife.
Clean up any excess with a damp cloth within 30 minutes of application.
Tested to BS EN 1366-3:2004 and BS EN 1366-4:2006, this acoustic sealant can achieve up to 4 hours of fire integrity and insulation for a variety of linear and penetration seals.
It also meets BS EN ISO 10140-2:2010 standards for airborne sound insulation, helping to maintain the performance of plasterboard partition walls with a Sound Reduction Index of 55dB.
Features
- Solvent-free formulation
- Permanently flexible and non-shrinking
- Maintains acoustic and fire integrity
- Conforms to EN 1366-3, EN 1366-4, and EN ISO 10140-2:2010
- Up to 4-hour fire rating achievable
Deliveries are made Monday to Friday between 8:00 a.m. and 6:00 p.m., and goods will be dropped as close to the property as possible. Please note, drivers are unable to carry items indoors.
Palletised deliveries are charged at a flat rate of £60 + VAT, regardless of how many pallets are required. Smaller orders under 20kg are sent via courier at £20 + VAT.
We hold high stock levels and aim to deliver within 3–4 working days. Once your order is placed, you’ll receive confirmation of the expected delivery date. Please ensure someone is available to sign for the goods.
Need a specific delivery date or have questions? Contact us or call us on 01423 339163 – we’re happy to help. For full details, please review our delivery terms.
Got a question?
Send us a message, and we’ll respond as soon as possible. Alternatively, call 01423 339163 to speak with an adviser.