Acoustic board with non-combustible sound-absorbing facing

Megasorber PN is a semi-rigid sound absorption board with a patented acoustically tuned non-combustible sound absorbing facing Soundmesh® G8.

 It is specially designed as acoustic backing for timber or aluminium battens.  The acoustic performance is up to NRC 0.80 with an air gap.  It is a pinnable acoustic board.




dark grey






Sound absorber video

Hear how Megasorber acoustic materials reduce reverberation and echo

The unique Soundmesh®® G8 facing material has BS 476 Part 4 “non-combustible” classification, BCA (Building Code of Australia) Group 1 Fire Classification and ISO 5660 Group 1 Fire Classification. It complies with IMO Resolution A653(16) requirements and has high-temperature resistance up to 550°C.

Megasorber PN has BCA (Building Code of Australia) Group 2 Classification as per AS5637.1-2015. It complies with IMO Resolution A653(16) requirements.

Megasorber PN is designed for

  • acoustic backing board for timber battens, timber slats and so on;
  • Perforated or slotted panels;
  • drop-in ceiling tiles for standard ceiling grid;
  • printable acoustic board and
  • Pinnable acoustic board.

A fluid/water repellent Soundmesh® G8 facing option is also available. The built-in water / fluid repellent property provides easy cleaning and maintenance of the facing and makes it suitable for outdoor applications.

Standard facing colours are: white (W), black (B), grey (G) and sandstone (S). Soundmesh® G8 can be colour-matched to any specific colour; however, minimum order quantity will apply.

The unique sound absorption of Megasorber PN with an airgap


  • Commercial and office buildings
  • Call centres
  • School buildings
  • Restaurants, bars, clubs
  • Music rooms, recording studios, home theatres
  • Sports stadiums, multipurpose halls, school halls
  • Indoor swimming pools.

Features and benefits

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Key Features

  • Superior absorption with NRC up to 0.80
  • Inherently fire-resistant facing
  • BCA Group 2 Classification as per AS5637.1-2015
  • IMO Resolution A653(16) compliant
  • Tough, durable and (optional) water/fluid repellent facing
  • Environmentally friendly with 100% recyclable acoustic polyester wool
  • Long service life, i.e., will not deteriorate when exposed to hot and humid conditions.


  • Reduce reverberation noise effectively
  • Inherently fire resistant facing to reduce potential fire hazards further
  • Thin and effective, no need for the bulky insulation batts
  • Non-hazardous, safe to handle
  • Easy to install, i.e., low installation costs
  • Low maintenance costs.

Acoustic Properties

The Megasorber PN panel provides superior acoustic performance with a plenum.

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Typical results when tested in a reverberation room:

Sound Absorption of Megasorber PN5 with a Timber Slat Panel

Tested to AS ISO 354-2006 Acoustics: Measurement of sound absorption in a reverberation room

Sound Absorption of Megasorber PN5

Tested to AS ISO 354-2006 Acoustics: Measurement of sound absorption in a reverberation room

Sound Absorption of Megasorber PN8

Tested to AS ISO 354-2006 Acoustics: Measurement of sound absorption in a reverberation room

Technical specifications

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Product Codes

Standard thickness 25mm, 50mm, 100mm

Product Code Thickness Panel Size
Megasorber FM25 25mm 1.2m x 2.4m
Megasorber FM50 50mm 1.2m x 2.4m
Megasorber FM100 100mm 1.15m x 2.35m

Other thicknesses available: (minimum order quantity applies) 12mm, 38mm & 75mm


  1. Base foam is either white or light-grey;
  2. Standard facing colours are: white, grey and black; Aquatic, Dark Grey and Sandstone are made to order.  We offer custom cutting to size, please note that cutting charges will apply. Prices will be quoted on the application.
  3. Product code with optional extra:
  4. G8 facing may have a stripy appearance and creases. Hairline creases may appear on the facing when The creases do not affect the acoustic performance.
  5. There are colour variations between batches; whilst we take every care to minimise batch-to-batch variation, in some instances, variation may be unavoidable and will occur.
  6. Dimensional change will occur in the FM foam substrate with a change in relative humidity and temperature, this may cause creasing on the Soundmesh® G8 facing. The creases do not affect acoustic performance.
  7. Thickness tolerance is ± 5%, and sheet dimension tolerance is ± 1%.
  8. The standard sheet size is 2m x 2.4m. Other sheet sizes available: 1200mm x 1200mm and 1200mm x 600mm (1195mm x 595mm if packed in boxes). We can cut panels to size; however, extra cutting charges apply.
  9. Water repellent facing is recommended for easy surface
  10. Recommended adhesive is Megasorber A200 or Megasorber


Thickness (mm)







Base Foam

W = White

G = Grey

Soundmesh® G8

RW = Water repellent white

B = Black

RB = Water repellent black

G = Grey

RG = Water repellent grey

DG = Dark Grey

RDG = Water repellent dark grey

RS = Water repellent sandstone

RQ = Water repellent aquatic

Optional extra

DS = G8 on both sides

Blank = G8 on one side only

Physical Properties

  1. Base foam colour: White or light grey;
  2. Density, weight and thermal insulation (R-value) properties
Product Code FM12 FM25 FM38 FM50 FM75 FM100
Nominal density (kg/m³) 25 16 13 12 11 10
Nominal weight (kg/m2) 0.30 0.40 0.50 0.60 0.80 1.0
R-value* 0.35 0.74 1.12 1.47 2.21 2.94

* Calculated value based on thermal conductivity @ 15


  1. AS 1 – 2015 Determination of fire hazard properties:

Product Group Number Classification                                                                                    Average Specific Extinction Area

Group 1                                                                                    98.3 m²/kg

  • 1-2015: Reaction to Fire Tests – Heat Release Smoke Production and Mass Loss Rates. Group 1 Classification.
  • 3.1989: Early Fire Hazard Properties: Simultaneous Determination of Ignitability, Flame Propagation, Heat Release:
Ignitability Spread of Flame Heat Evolved Smoke Developed
0 0 0 4
  • BS 476-6:1989+A1:2009 Fire tests on building materials and structures – Fire propagation of products:
Fire propagation index, I Sub-index, i1 Sub-index, i2 Sub-index, i3
7.4 5.3 2.1 0.1

AS ISO 354-2006 Measurement Results

Hz FM12 FM25 FM38 FM50 FM75 FM100
100 0.00 0.07 0.11 0.15 0.27 0.40
125 0.00 0.1 0.16 0.22 0.32 0.60
160 0.05 0.14 0.23 0.33 0.61 0.89
200 0.05 0.17 0.40 0.63 0.77 0.96
250 0.10 0.31 0.52 0.84 0.95 1.05
315 0.15 0.48 0.75 1.14 1.12 1.07
400 0.20 0.72 0.95 1.25 1.16 1.02
500 0.30 0.88 1.05 1.15 1.08 1.00
630 0.40 1.04 1.07 1.17 1.01 1.01
800 0.50 1.04 1.10 1.13 1.01 1.01
1000 0.65 1.03 1.09 1.08 0.96 0.96
1250 0.75 1.09 1.10 1.08 0.94 0.94
1600 0.90 1.05 1.04 1.02 0.96 0.96
2000 1.00 1.04 0.98 0.94 1.00 0.92
2500 1.05 0.99 0.91 0.9 0.96 0.96
3150 1.05 0.98 0.90 0.87 0.94 0.94
4000 1.00 0.9 0.89 0.9 0.95 0.95
5000 0.85 0.82 0.89 0.87 0.92 0.92
NRC 0.5 0.8 0.90 1.00 1.00 1.00
a 0.40(H) 0.60(MH) 0.90 1.00 1.00 1.00

Frequency                                             Random Incidence Absorption Coefficient

  • BS 476-7:1997 Fire tests on building materials and structures – Surface spread of flame of products Classification: Class
  • EN45545-2:2013+A1:2015 Railway Applications – Fire protection on railway vehicles Part 2: Requirements for fire behaviour of materials and components. Meets the requirements of R1 for HL1, HL2, HL3 Hazard Level Classification.

Volatile Organic Compounds (VOC)

ASTM D5116 “Standard Guide for Small-Scale Environmental Chamber Determinations of Organic Emissions from Indoor Material/ Products”: 0.016 mg/m2/hr (well below the GreenTag requirement limit of 0.5mg/m2/hr).

Download the technical specifications

Installation instructions

These recommendations are for general guidance only. Installation methods must be tested under actual service conditions to determine their suitability for a particular purpose.

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Keep acoustic panels flat. Panels must be kept flat during the handling and installation process. Bending or folding sheets may create creases on the Soundmesh® G8 facing. Once formed, these creases are difficult to remove.

Cutting (if required). The panel can be hand-cut by a knife (sharp utility knife or similar) or machine-cut by a bench saw or rotating blade cutter with a toothless blade.

Note: It is recommended to wear gloves during cutting. The Soundmesh® G8 facing edges may irritate or cut the skin.

Clean substrate surface with Megasorber AC5, acetone or similar. The surface must be dry, free of oil, dust, grease, rust and other contaminants.

Install the panels direct-fix using Megasorber A200 or A100 adhesives, with express finish edges or between panels using powder coated aluminum trim.

Clean dirt and marks on the Soundmesh® G8 facing with Megasorber

M8 Clean block and water. Dry with a microfiber cloth. Remove excessive adhesive on hands, cloth or equipment with Megasorber AC5.

Direct-fix acoustic panels using Megasorber A200 adhesive.

Available in 600ml sausage for caulking gun and 290ml cartridges for cartridge gun.

  1. Apply adhesive on the back of the acoustic panel (NOT on the Soundmesh® G8 facing).
  2. Install the panel immediately after application of the

Application Pattern

Full-size panel (1.2m x 2.4m) adhesive application 

Minimum bead size (glue width) = 10mm to 15mm diameter. Recommended usage: approx. 1.5 to 2 sausages per full-size panel (1.2m x 2.4m), or approx. 2-3 cartridges per full-size panel.

Direct-fix with Megasorber A100

Spray Adhesive

  1. Connect a hose and spray gun to the new canister. Roll the canister backwards and forwards vigorously for 1-2 minutes to ensure the adhesive has not settled or separated during transit.
  2. Spray adhesive onto the back of the acoustic panel (not on the Soundmesh® G8 facing). Spray one coat to seal the porous surface vertically and then a second coat horizontally to achieve maximum adhesive contact.
  3. Spray adhesive on the substrate
  4. Allow adhesive to dry thoroughly. The adhesive should be touch-dry in 3-5 minutes (depending on conditions).
  5. Bond both surfaces together within 10 minutes of the adhesive being touch-dry.
  6. Apply uniform pressure over the surface after

Spray patterns


Note: we recommend A100 on a smooth surface, such as refrigeration panels, plasterboards and metal panels. A100 is not suitable for uneven or textured surfaces. For uneven or textured surfaces, such as concrete soffit and brickwork, we recommend A200 adhesive.


Express Finish.

Leave a gap of 20mm to 30mm between panels

Powder-coated aluminium or metal trims

FM50 Acoustic Panel

Download the installation guide

Information for Specifiers

Please feel free to use the information to include in your project specifications.

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Soundproofing case studies