MetalHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Perforated steel panel backed with 6 pcf mineral fiber
M-90 panel
PTB reference data
Original description
Perforated steel panel backed with 6 pcf mineral fiber
Material properties
Manufacturer: Empire Acoustical Systems
Thickness: 2 1/2 inch, 3 1/2 inch
Wall distance: 0 mm
Backing: 6 pcf mineral fiber
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
1.04
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.80 | 1.25 | 1.15 | 1.15 | 1.05 | 0.80 |
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| Compare | Value | ||
|---|---|---|---|
| 3 1/2 inch | 3.7 lb/ft² | αw1.04 | |
| 2 1/2 inch | 2.2 lb/ft² | αw0.92 |
Distance: 0
