MetalHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Value from the PTB table, not verified
Perforated aluminum panel, with corrugations 5/8 inch deep, 1 1/2 pcf 2 inch fiberglass backing
Flat Baf
PTB reference data
Original description
Perforated aluminum panel, with corrugations 5/8 inch deep, 1 1/2 pcf 2 inch fiberglass backing
Material properties
Manufacturer: Alpro Structural Systems Corp.
Thickness: 2 in
Wall distance: 16 in
Perforation: perforated
Backing: 2 in fiberglass (24.03 kg/m³)
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
1.00
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.70 | 1.00 | 1.00 | 1.00 | 1.00 | 0.85 |
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Value from the PTB table, not verified
NRC: 1.00 (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 |
|---|---|---|---|---|---|---|---|
| 2 inches · 1 lb/ft² · 400 mm | 1.00 | 0.72 | 0.98 | 1.00 | 1.07 | 1.02 | 0.84 |
Measured values as a table (1 measurement)
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