GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-12
Value from the PTB table, not verified
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
0.70
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 | αw0.70 | |
| 74 mm | αw0.65 |
Dimensions: 625 x 625 mm
Measured values as a table (2 measurements)
| 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 | 0.70 | 0.85 | 0.95 | 0.84 | 0.78 | 0.80 | 0.68 | 0.73 | 0.78 | 0.75 | 0.80 | 0.78 | 0.72 | 0.74 | 0.58 | 0.47 | 0.50 |
| 6 mm + Al-Folie + 25 mm Mineralfasereinlage · 74 mm | 0.65 | 0.23 | 0.27 | 0.44 | 0.68 | 0.85 | 0.93 | 0.98 | 0.93 | 0.78 | 0.70 | 0.65 | 0.68 | 0.73 | 0.55 | 0.48 | 0.53 |
Measured values as a table (2 measurements)
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