MetalHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Wärme Kälte Schall, Heft 1 (March) 1970
Value from the PTB table, not verified
Perforated metal cassette ceiling with 20 mm Sillan acoustic panels
PTB reference data
Original description
Perforated metal cassette ceiling with 20 mm Sillan acoustic panels
Material properties
Wall distance: 350 mm
Perforation: approx. 15%
Backing: 20 mm Sillan acoustic panels
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.80
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.50 | 0.85 | 0.70 | 0.85 | 0.85 | 0.80 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 350 mm | 0.80 | 0.40 | 0.60 | 0.75 | 0.76 | 0.97 | 0.80 | 0.70 | 0.63 | 0.80 | 0.87 | 0.83 | 0.85 | 0.83 | 0.83 | 0.82 | 0.82 |
Measured values as a table (1 measurement)
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