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 steel panel, 1 1/2 pcf fiberglass backing, 2 inch thick
Flat Baf
PTB reference data
Original description
Perforated steel panel, 1 1/2 pcf fiberglass backing, 2 inch thick
Material properties
Manufacturer: Alpro Structural Systems Corp.
Thickness: 2 inch
Wall distance: 0 in
Backing: 1 1/2 pcf fiberglass
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 | 0.20 | 0.65 | 1.00 | 1.00 | 1.00 | 0.90 |
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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 · 1.5 lb/ft² · 0 | 1.00 | 0.21 | 0.66 | 1.13 | 1.14 | 1.00 | 0.90 |
Measured values as a table (1 measurement)
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