WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Odeon (Index 1005)
Value from the PTB table, not verified
3.5-4 mm boards (asbestos, plywood or hard fiberboard), 13% perforation
PTB reference data
Original description
3.5-4 mm boards (asbestos, plywood or hard fiberboard), 13% perforation
Material properties
Thickness: 3.5-0.2 in
Wall distance: 1 in
Perforation: approx. 13%
Hole size: 4.5-0.2 in
Backing: 1 in mineral wool
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.50
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.05 | 0.20 | 0.20 | 0.15 | 0.15 |
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Value from the PTB table, not verified
NRC: 0.50 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 63 Hz | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz | 6300 Hz | 8000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.50 | 0.08 | 0.00 | 0.08 | 0.00 | 0.00 | 0.20 | 0.00 | 0.00 | 0.55 | 0.00 | 0.00 | 0.65 | 0.00 | 0.00 | 0.50 | 0.00 | 0.00 | 0.40 | 0.00 | 0.00 | 0.40 |
Measured values as a table (1 measurement)
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