Sound-Absorbing Materials for Machinery and Technical Applications
Reducing Airborne Sound in Housings, Enclosures and Technical Installations
Sound absorbers are used to reduce reflected airborne sound within machines, housings, cabins and enclosures. Their open-cell or fibrous material structure absorbs part of the incident sound energy and thereby reduces sound reflections.
OTO Akustiktechnik supplies a range of sound-absorbing materials for industrial and technical applications. Depending on the requirements, different foams, fibre absorbers, nonwoven materials and surface finishes are available.
The most suitable solution depends on factors including the relevant frequency range, available installation space, ambient temperature, moisture, contamination and any fire-safety requirements.
Typical Applications
- machine guards and enclosures
- noise-control cabins and acoustic enclosures
- engine covers and protective hoods
- compressors, generators and power units
- ventilation and air-conditioning systems
- silencers and acoustic splitter elements
- road and rail vehicles
- technical equipment and loudspeaker enclosures
Selection Criteria
- required sound absorption and relevant frequency range
- available installation space and required material thickness
- temperature and moisture exposure
- contact with oil, fuel, dust or cleaning agents
- fire-safety and surface requirements
- self-adhesive backing or mechanical fastening
- full-size sheet, custom-cut part or die-cut part
PU Foams for Airborne Sound Absorption
Open-cell polyurethane foams are used to absorb airborne sound. Depending on the application and environmental conditions, different material thicknesses, densities, surfaces and treatments can be selected.
Available versions may include:
- smooth or profiled surfaces
- convoluted or pyramidal structures
- self-adhesive backing
- protective films or technical facing layers
- custom-cut parts and shaped components
When selecting a suitable material, the sound source, available installation space and environmental conditions must be taken into account.
antiphon® SA Broadband Absorber
antiphon® SA is a panel-shaped broadband absorber for industrial applications. Its fibre-based core consists predominantly of recycled cotton and textile fibres. Different surface and film versions are available depending on the intended application.
Depending on the operating environment, the material can be supplied with different surfaces or film coverings. These versions can help protect the absorber against dirt, moisture, oil mist or cleaning exposure.
Typical Applications of antiphon® SA
- engine and machine covers
- compressors and power units
- production machinery
- enclosures and noise-control cabins
- air-conditioning and ventilation systems
- acoustic splitter elements and technical panels
Currently stocked format: approx. 825 × 1,100 mm
Material thicknesses: approx. 7 mm and 13 mm
Standard surface: tear-resistant polyester film
Additional quantities and versions: on request and subject to availability
For larger quantities and custom-cut parts, we will prepare an application-specific quotation.
Open the technical data sheet for antiphon® SA
Polyester Wadding
Typical Applications
- loudspeaker enclosures
- vehicle and equipment manufacturing
- furniture and upholstery production
- textile applications
- technical cavities and panels
Polyester wadding consists of thermally bonded polyester fibres. Different material thicknesses, surface masses and roll widths are available depending on the application.
In loudspeaker enclosures, the material is used for internal acoustic damping. We also manufacture customer-specific custom-cut and die-cut parts for industrial applications.
For larger quantities, the material can be supplied in space-saving vacuum packaging on request.
Further information about custom-cut and die-cut parts
CARUSO-ISO-BOND® Insulation Boards
CARUSO-ISO-BOND® is a fibre-based insulation and absorber material. Depending on the version, it can be used for thermal insulation, sound insulation and airborne sound absorption.
The material currently in stock consists of polyester fibres and, according to the available product documentation, contains no additional binders. Further technical information is available on request.
Currently stocked format: approx. 1,200 × 625 × 30 mm
Additional quantities and versions: on request and subject to availability
Porofib Felt Nonwoven
Typical Applications
- engine-bonnet insulation
- wheel-arch liners
- vehicle panels
- washing machines and domestic appliances
- technical housings and cavities
Porofib is a bonded felt nonwoven for acoustic and technical applications. Its suitability depends on the particular material version and the environmental conditions.
Currently stocked format: approx. 1,000 × 800 × 20 mm
Additional quantities and versions: on request and subject to availability
Which Sound-Absorbing Material Is Suitable for Your Application?
To select a suitable material, we require the most precise information possible about the sound source and operating conditions. The following details are particularly helpful:
- description of the machine, housing or enclosure
- available installation space and required material thickness
- dimensions and required quantity
- temperature and moisture conditions
- contact with oil, water, fuel, dust or cleaning agents
- fire-safety or surface requirements
- required fastening method and component geometry
If the unwanted noise is primarily caused by a vibrating sheet-metal component, a sound absorber alone may not be sufficient. In this case, OTO-Akustikblech, damping pads or bitumen-based damping sheets may also be suitable.
Request sound-absorbing material and a quotation
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