GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-13
Value from the PTB table, not verified
Perforated gypsum cassette with mineral fiber inlay and aluminum foil
PTB reference data
Original description
Perforated gypsum cassette with mineral fiber inlay and aluminum foil
Material properties
Thickness: 6 mm + aluminum foil + 25 mm mineral fiber inlay
Wall distance: 344 mm
Dimensions: 625 × 625 mm
Perforation: 15%
Hole size: 4.5 mm
Backing: aluminum foil, 25 mm mineral fiber inlay
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.75
Frequency values
αp nach ISO 11654
| f (Hz) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.90 | 0.80 | 0.85 | 0.75 | 0.55 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 mm + Al-Folie + 25 mm Mineralfasereinlage · 344 mm | 0.75 | 0.98 | 0.90 | 0.89 | 0.89 | 0.76 | 0.76 | 0.82 | 0.82 | 0.88 | 0.80 | 0.82 | 0.73 | 0.75 | 0.55 | 0.51 | 0.53 |
Measured values as a table (1 measurement)
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