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 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 in
Backing: 6 pcf mineral fiber
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
1.10
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.35 | 1.00 | 1.00 | 1.00 | 1.00 | 0.80 |
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| Compare | Value | ||
|---|---|---|---|
| 2 1/2 inch | 2.2 lb/ft² | NRC1.10 | |
| 3 1/2 inch | 3.7 lb/ft² | NRC1.15 |
NRC: 1.10 (derived from ISO 354 lab data)
Distance: 0
Measured values as a table (2 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 2 1/2 inch · 2.2 lb/ft² · 0 | 1.10 | 0.36 | 1.01 | 1.23 | 1.14 | 1.02 | 0.78 |
| 3 1/2 inch · 3.7 lb/ft² · 0 | 1.15 | 0.81 | 1.25 | 1.17 | 1.16 | 1.05 | 0.82 |
Measured values as a table (2 measurements)
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