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 3 1/2 pcf USG Thermafiber in Mylar
PTB reference data
Original description
Perforated steel panel backed by 4 inch layer of 3 1/2 pcf USG Thermafiber in Mylar
Material properties
Manufacturer: Commercial Acoustics
Thickness: 4 1/4 inch
Wall distance: 0 mm
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.50
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.50 | 0.35 | 0.65 | 0.60 | 0.55 | 0.30 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 4 1/4 inch · 5 lb/ft² · 0 | 0.50 | 0.52 | 0.37 | 0.64 | 0.60 | 0.56 | 0.29 |
Measured values as a table (1 measurement)
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