Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-16
Value from the PTB table, not verified
Perforated asbestos cement cassette with non-woven fiber
PTB reference data
Original description
Perforated asbestos cement cassette with non-woven fiber
Material properties
Thickness: 4 mm + non-woven fiber
Wall distance: 100 mm
Dimensions: 600 x 600 mm
Perforation: 17%
Hole size: 6 mm
Backing: Non-woven fiber 15.5 Rayl
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.65
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.55 | 0.85 | 0.80 | 0.60 | 0.55 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 mm + Faservlies · 100 mm | 0.65 | 0.15 | 0.18 | 0.35 | 0.48 | 0.55 | 0.62 | 0.80 | 0.80 | 0.88 | 0.90 | 0.84 | 0.68 | 0.55 | 0.61 | 0.58 | 0.55 | 0.54 | 0.50 | 0.48 |
Measured values as a table (1 measurement)
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