GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-12
Perforated gypsum cassette with mineral fiber inlay
PTB reference data
Original description
Perforated gypsum cassette with mineral fiber inlay
Material properties
Thickness: 6 mm
Wall distance: 344 mm, 74 mm
Dimensions: 625 × 625 mm
Perforation: 15%
Hole size: 4.5 mm
Backing: paper-faced Al foil on the back (0.07 kg/m²) with 25 mm mineral fiber inlay
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.69
Frequency values
αp per ISO 11654
| f (Hz) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.85 | 0.75 | 0.80 | 0.75 | 0.50 |
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| Compare | Value | |
|---|---|---|
| 344 mm | αw0.69 | |
| 74 mm | αw0.66 |
Dimensions: 625 x 625 mm