Everbuild AC95 Acoustic Sealant

  • Intumescent acrylic acoustic sealant
  • Up to 32 linear meters of coverage per tube
  • Fits a jumbo caulking gun
  • Designed to fill holes or gaps that allow noise transfer
  • Paintable
  • Permanently flexible


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AC95 Acoustic Sealant & Adhesive is an intumescent acrylic sealant and adhesive specifically formulated for fire rated sealing and bonding applications on plasterboard and other kraft lined insulation boards. Provides up to 5 hours fire resistance, tested to BS 476, part 20/EN1366-4 (2006). Acoustic rated to BS EN ISO 140/3. Tested for air permeability to EN13141-1 Ventilation for buildings. Performance testing for components/products for residential ventilation.


You will also require Jumbo Sealant Gun.


  • Forms a fire rated acoustic barrier - up to 5 hour fire rating - 25% greater than conventional/competitive fire rated sealants
  • Permanently flexible/high grab
  • Adheres to most surfaces
  • Mould resistant
  • Non flammable
  • Over-paintable
  • Easy clean up
  • Approx. 32 linear meters of coverage for a 6mm diameter bead.

Areas For Use

  • To form an acoustic and intumescent barrier by sealing gaps between plasterboard walls, floors and ceilings and dry lining applications.
  • As an adhesive to bond plasterboard to plasterboard and to bond plasterboard to wood and metal studding and direct to block work.
  • For sealing and bonding most other kraft lined insulation boards.


  • Damp or humid conditions will significantly extend the cure time.
  • Do not attempt to abrade when cured.
  • Do not overpaint until product has fully cured. This will normally be 24 hours but may be 4-5 days in damp, cold or humid conditions.
  • Do not apply below 5øC.
  • For overhead boarding applications, always use in conjunction with mechanical fixings.

Surface Preparation

All surfaces must be clean and dust free.  All loose or flaking surface coatings, and old sealant and mastic joints, should be removed before application. Highly porous substrates such as new plaster should first be primed with Everbuild PVA bond diluted 1:4 with water. Surfaces may be slightly damp, but not wet. NOTE: THIS WILL SLOW THE CURE.


Fit cartridge into a 1ltr mastic gun. Cut nozzle to required length and puncture inner membrane seal before applying.

Use as a sealant: Always cut nozzle to a size slightly larger than the gap to be sealed.. Apply to 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.

Use as an adhesive for direct bonding to large surfaces: Cut nozzle to provide a bead of approximately 9-10mm diameter, pierce inner membrane and apply a continuous bead to one surface at 250-350mm centres. Apply board immediately to surface and tamp down. Provide temporary support until cured.

Use as an adhesive for bonding to studding: Apply a continuous bead to studding and apply board immediately into position. Do not apply more than one board's width of studding at one time. Provide temporary support until cured.

Specific Data


Product Form Ready to use thixotropic paste
Product Volume 900ml
Specific Gravity 1.57-1.6
Elongation at Break (%) 100-200%
Hardness (Shore A)
Approximately 40
Tack Free Time 15 to 60 mins, dependent on thickness, ambient temperature and humidity
Full Cure 1 to 5 days, dependent on thickness, ambient temperature and humidity
Solids Content 83%
Slump Resistance No slump at 25øC when placed in a 20mm x 10mm vertical channel
Application Temperature Range +5øC to +40øC
Service Temperature Range -15øC to +70øC
Chemical Resistance

Dilute Acids  - Fair

Dilute Alkaline - Fair

Aliphatic Hydrocarbons - Fair

Aromatic Hydrocarbons - Poor

Movement Accommodation Low to medium (+/- 7.5%)
Durability Up to 15 years when used as recommended

Can be used in contact with most building and decorating materials but should not be used against bituminous materials.




Gap Face Material Combination Width/Depth (mm) Backing Material Integrity (mins) Insulation (mins)
Aerated Concrete / Steel 30/15 PE Open Cell Foam 300 91
Aerated Concrete / Aerated Concrete 20/10 PE Open Cell Foam 300 300
Aerated Concrete / Aerated Concrete 10/10 PE Open Cell Foam 300 #
Aerated Concrete / Aerated Concrete 30/15 PE Open Cell Foam 300 215





Gap Face Material Combination Width/Depth (mm) Backing Material Integrity (mins) Insulation (mins)
A Aerated Concrete / Aerated Concrete 30/15 PE Open Cell Foam 300 66
B Aerated Concrete / Aerated Concrete 20/10 PE Open Cell Foam 300 133
C Aerated Concrete / Aerated Concrete 10/10 PE Open Cell Foam 300 #
D Aerated Concrete / Aerated Concrete 50/25 PE Open Cell Foam 300 215


# Evaluation against the insulation criteria of the standard could not occur due to the width of the specimen.

The overall test was discontinued after a period of 300 mins.


Health & Safety

Consult MSDS for full list of hazards



Store in cool dry conditions and protect from frost. 


To quickly find out the shipping cost for your order simply add the required items to your cart. Place your cursor over the cart icon at the top of the page. Click on "Calculate Cart Shipping". Select your country and region and enter your postcode. The shipping rate will be displayed. If your country is not listed please contact us for a shipping quote.

UK Shipping Charges For Most Products

Orders with a value of £0.00 to £54.99 have a £7.00 carriage charge with tracked next working day delivery.

Orders with a value of 55.00 to £99.99 have a £12.00 carriage charge with tracked next working day delivery.

Orders with a value of £100.00 or more qualify for free next day shipping.

Excluded Items

For carts which contain Plasterboard, Soundproofing Mat, SilentBoard, QuietPanel, Silent Floor Ultra, M20 and R10 the following charges apply

£8.00 carriage for the first item and £4.00 carriage for every item added up to a maximum charge of £75.00.

Some soundproofing items have a minimum order due to shipping constraints.

Bulk Products have a £75.00 pallet charge per item.


Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Non-returnable items:- Made to order items such as our Office Acoustic Panels and High End Audio Acoustic Panels, Gift cards.

To complete your return, we require a receipt or proof of purchase. Please contact us for your return authorisation number. Once your return is received and inspected, we will send you an email to notify you that we have received your returned item.


We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at info@advancedacoustics-uk.com and send your item to: Advanced Acoustics LTD, Unit B, Maunside, Green Line Industrial Estate, Mansfield, NG18 5GU, United Kingdom.

Customer Reviews

Based on 4 reviews
Lucy Burgess
Everbuild AC95

Just finished using this on all the floorboards and under the skirting and can already hear the difference. Can still hear talking but not actual words. Hopefully once I�ve laid the soundproofing mat, the result will be even better.


This large sealant is great for sealing between floorboards and around the edge of the room after laying Advanced Acoustics Soundproofing Mat. It is easy but quite heavy to use. (Like with most sealants) Beware how much sealant continues to spue out after you stop pumping the gun! It is cheaper than at some trade stores but you can get it cheaper elsewhere too.

M Edwards
Good product

Good product for office or studio build. using on garage to studio conversion. only downside is that you need a jumbo gun for it.

Easy to work with

Easy to work with. Cleans up easily. Didn’t get the best price though...