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, backed with 4 inch fiberglass
Type A250c – Almute
PTB reference data
Original description
Porous sintered metal panel, backed with 4 inch fiberglass
Material properties
Manufacturer: Peer
Thickness: 104.14 mm
Wall distance: 400 mm
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.90
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 1.00 | 0.95 | 0.85 | 0.90 | 1.00 | 1.00 |
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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 inches · 1.1 lb/ft² · 400 mm | 0.90 | 1.01 | 0.97 | 0.86 | 0.90 | 0.99 | 1.19 |
Measured values as a table (1 measurement)
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