PET Acoustic Nonwoven 40 mm (2.8 kg/m²) – High-Density Backing Nonwoven Made of Pure PET, Made in Germany
The vitAcoustic PET nonwoven is a soft, open-pore fiber absorber made of 100 % PET (polyester, fiber content approx. 60 % from recycled PET bottles). Unlike our PET felt panels, the nonwoven is not hot-pressed and therefore not self-supporting – it remains soft and flexible and is used as an insulation and absorber core behind cladding.
We offer it here as a standalone nonwoven panel without a composite facing – intended for backfilling by a carpenter, for example between battens, behind acoustic slats, or in drywall/stud walls. It combines two functions: sound absorption and thermal insulation in one. Size 2440x1220x40 mm, thickness 40 mm, areal weight 2.8 kg/m² (approx. 8 kg per panel).
Acoustic Performance (Derived from Reference Measurements According to ISO 354)
As a soft, open-pore absorber, the nonwoven is significantly more effective directly on the wall than a rigid panel of the same thickness – with an air cavity behind it or as part of a composite, it achieves peak performance. We specify the weighted sound absorption coefficient αw and the NRC value:
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Directly on the wall: αw 0.70 / NRC 0.80 – Class C
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Between battens / with a cavity behind it: up to Class B
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Freestanding or suspended with a large gap: up to sound absorption class A
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As a nonwoven composite with our 9-mm PET felt panel: sound absorption class A (this 40-mm nonwoven is the exact backing material used in our standard 9 + 40 mm nonwoven composite)
Values derived from reference measurements of comparable 100 % PET nonwovens (tested according to ISO 354) for our specific thickness and density – no separate test report is available for this configuration. Rating according to DIN EN ISO 11654; conservatively estimated. The exact performance depends on the construction (air cavity, cladding).
The nonwoven thus helps reduce reverberation time according to DIN 18041 – particularly effective as cavity infill behind open or perforated cladding.
Maximum Absorption: Nonwoven Composite with the 9-mm Panel
Combined with our 9-mm PET felt panel, the nonwoven forms the vitAcoustic nonwoven composite: The rigid, designed panel forms the visible face, while the soft nonwoven behind it provides absorption extending to lower frequencies. This composite achieves sound absorption class A when mounted flat directly on the wall – without an air gap or battens. We supply finished composite panels ready to install; the loose nonwoven panel offered here is the alternative for custom assembly by a carpenter.
Applications
Infill between battens: as an absorber core behind acoustic slats, wood strips, or perforated/open cladding – fills the cavity and makes the construction acoustically effective.
Drywall and stud walls: as an absorbent and insulating insert in wall linings and partition walls.
Sloped ceilings and interior insulation: sound absorption and thermal insulation in one step – warm, quiet living spaces, workspaces, and hobby rooms.
DIY absorbers: as infill for custom-built ceiling clouds, wall absorbers, or bass traps.
Thermal Insulation and the Advantage of High Density
PET nonwoven is known as a thermal insulation material – for example, for attic conversions and interior wall insulation. However, conventional insulation nonwovens have a significantly lower density and therefore cannot be sawed cleanly with woodworking machinery. At 70 kg/m³, our nonwoven is much denser: It can be cut to size as usual with a circular saw and processed cleanly. At the same time, its thickness tolerance of +0/−2 mm is tighter than that of insulation nonwovens – making it suitable for our ready-to-install composite panels as well.
As vapor-permeable PET fiber insulation, the nonwoven regulates wall moisture and creates a comfortable indoor climate: noticeably warmer surfaces, no clammy walls, and therefore often lower heating needs. It is widely used for interior wall and sloped ceiling insulation – sound control and thermal insulation in one step. PET fiber insulation materials typically fall within thermal conductivity groups WLG 035–040; because our nonwoven is denser than conventional insulation nonwovens, its insulation performance is at least comparable. We deliberately do not specify a declared λ value for this particular panel.
Processing and Installation
The high-density nonwoven can be cut to size with standard circular saws. The same processing rules apply as for PET felt panels:
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Nothing should vibrate: The workpiece and saw must remain stable, flat, and aligned – otherwise, frictional heat can partially melt the PET (fused areas).
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Clean, sharp tools and a steady feed rate ensure a smooth cut.
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Securing in the cavity: insert, friction-fit, or secure with a tested adhesive; fit snugly between battens.
Note: The nonwoven is not self-supporting – it requires a supporting structure (battens, framing, cladding) or a composite bond with the rigid panel.
Material and Origin
The nonwoven consists of 100 % PET (thermally bonded nonwoven fabric made from PES staple fibers, fiber content approx. 60 % from recycled PET bottles) and is manufactured in Germany (Made in Germany). It contains no chemical additives, is allergy-friendly, resistant to mold, pests, and house dust mites, and recyclable at the end of its service life.
- High density (70 kg/m³) – can be sawed with machinery, tight thickness tolerance of +0/−2 mm
- Minimal sorption moisture content (approx. 1.02 % according to DIN 52620)
- Soft and flexible – not self-supporting
- Vapor-permeable – combines sound absorption with thermal insulation
Certificates and Standards
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Flame-resistant according to EN 13501-1 (B-s1,d0) – corresponds to fire class B1
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OEKO-TEX Standard 100 – tested for harmful substances
- Resistant to fungi according to DIN EN ISO 846
Technical Properties
| Property |
Value |
| Construction |
Soft, open-pore PET nonwoven (thermally bonded, not hot-pressed); not self-supporting |
| Material |
100 % PET (PES staple fibers), no chemical additives |
| Thickness |
40 mm |
| Areal weight |
2.8 kg/m² (70 kg/m³); approx. 8 kg per 2440x1220x40 mm panel |
| Acoustic function |
Porous broadband sound absorber; also provides thermal insulation |
| Sound absorption class |
C mounted directly · up to B in a cavity/between battens · A suspended or as a nonwoven composite with a 9-mm panel |
| αw |
0.70 (mounted directly); higher with an air cavity/composite · derived from reference measurements, according to DIN EN ISO 11654 |
| NRC |
0.80 (mounted directly); higher with an air cavity/composite |
| Frequency range |
Broadband; primarily mid/high frequencies when mounted directly, extending into the low-midrange with an air cavity |
| Color configuration |
Natural white (technical backing/insulation nonwoven, usually concealed) |
| Made to measure |
Size 2440x1220x40 mm; cut to size with a circular saw, thickness tolerance +0/−2 mm |
| Origin |
Made in Germany |
| Recycled content |
Fiber content approx. 60 % from recycled PET bottles |
| Environmental declaration |
OEKO-TEX Standard 100; recyclable |
| Fire classification |
Flame-resistant B-s1,d0 according to EN 13501-1 (corresponds to B1) |
| Harmful substance testing |
OEKO-TEX Standard 100 |
| Stability |
Not self-supporting – requires a supporting structure or composite construction |
| Care |
Maintenance-free when used as a concealed insert |
Samples, Data Sheets, and Shipping
Free samples are available in the Samples and Miscellaneous category. Technical data sheets, absorption values, and certificates are available in our download area. As bulky, lightweight goods, the nonwoven is shipped on pallets as palletized freight via a freight forwarder.
Are you planning a project or need custom dimensions? Call us at +49 7248-93566-90 or email [email protected].
