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
Porous sintered metal panel
Type A300c – Almute
PTB reference data
Original description
Porous sintered metal panel
Material properties
Manufacturer: Peer
Thickness: 0.1 in
Wall distance: 7.9 in, 16 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 3 variants
NRC
0.80
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.95 | 0.90 | 0.60 | 0.75 | 0.90 | 1.00 |
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| Compare | Value | ||
|---|---|---|---|
| 0.8 lb/ft² | 16 in | NRC0.80 | |
| 0.9 lb/ft² | 7.9 in | NRC0.70 | |
| 0.9 lb/ft² | 16 in | NRC0.65 |
NRC: 0.80 (derived from ISO 354 lab data)
Dimensions: 20 x 20 inches
Measured values as a table (3 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 3 mm · 0.9 lb/ft² · 200 mm | 0.70 | 0.44 | 0.81 | 0.87 | 0.52 | 0.69 | 0.80 |
| 3 mm · 0.9 lb/ft² · 400 mm | 0.65 | 0.85 | 0.80 | 0.46 | 0.60 | 0.70 | 0.80 |
| 3 mm · 0.8 lb/ft² · 400 mm | 0.80 | 0.95 | 0.88 | 0.60 | 0.74 | 0.88 | 1.07 |
Measured values as a table (3 measurements)
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