MetalBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: M. Heckl, H.A. Müller: Taschenbuch der Technischen Akustik, Springer 1994
Value from the PTB table, not verified
Aluminum metal panels with mineral fiber backing
PTB reference data
Original description
Aluminum metal panels with mineral fiber backing
Material properties
Thickness: 0 in
Wall distance: 6.5 in
Perforation: free slot width between panels 0.6 in
Backing: 0.8 in mineral fiber panel
Flow resistance: 0.06 kPa·s/m²
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.60
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.60 | 0.80 | 0.65 | 0.25 | 0.15 |
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Value from the PTB table, not verified
NRC: 0.60 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 0,5 mm · 164 mm · hinterlegt with 20 mm mineral-fibre panel 2,5 kg/m^2, 60 Rayl · freie Schlitzbreite zwischen Panellen 15 mm | 0.60 | 0.25 | 0.59 | 0.81 | 0.64 | 0.26 | 0.17 |
Measured values as a table (1 measurement)
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