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 backed by 4 inch layer of 2 pcf OCF Type R-23 Fiberglas
PTB reference data
Original description
Perforated steel panel backed by 4 inch layer of 2 pcf OCF Type R-23 Fiberglas
Material properties
Manufacturer: Commercial Acoustics
Thickness: 4 1/4 inch
Wall distance: 0 in
Density: 2 pcf
Backing: 4 inch layer of 2 pcf OCF Type R-23 Fiberglas
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
1.10
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.85 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
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Value from the PTB table, not verified
NRC: 1.10 (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 |
|---|---|---|---|---|---|---|---|
| 4 1/4 inch · 5 lb/ft² · 0 | 1.10 | 0.86 | 1.09 | 1.22 | 1.06 | 1.05 | 1.04 |
Measured values as a table (1 measurement)
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