FeltHighly 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
Suspended acoustical panels
Baffle
PTB reference data
Original description
Suspended acoustical panels
Material properties
Manufacturer: Siegfried Keller
Thickness: 5.5 in
Application: Baffle
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.95
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.65 | 0.90 | 1.00 | 1.00 | 1.00 |
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Value from the PTB table, not verified
NRC: 0.95 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 140 mm · 2.3 kg / m² | 0.95 | 0.30 | 0.65 | 0.90 | 1.10 | 1.15 | 1.30 |
Measured values as a table (1 measurement)
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