GypsumBroadband absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 193
Value from the PTB table, not verified
Knauf Perllit acoustic panel No. 72, grooved, square-hole perforation, 11.4%
Perllit acoustic panel – No. 72
PTB reference data
Original description
Knauf Perllit acoustic panel No. 72, grooved, square-hole perforation, 11.4%
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 1.2 in
Wall distance: 2 in, 20 in
Perforation: 11.4 %
Surface: grooved
Up to fire class: at least fire-retardant
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.65
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.80 | 0.70 | 0.65 | 0.60 | 0.55 | 0.40 |
Create a permanent free account — Access frequency bands, variants and export.
Free. No password required.
| Compare | Value | |
|---|---|---|
| 20 in | NRC0.65 | |
| 2 in | NRC0.65 |
NRC: 0.65 (derived from ISO 354 lab data)
Weight / density: ca. 18 kg / m²
Dimensions: 625 x 25 in
Measured values as a table (2 measurements)
| Build-up | NRC | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 30 mm · ca. 18 kg / m² · 50 mm | 0.65 | 0.20 | 0.17 | 0.19 | 0.31 | 0.46 | 0.63 | 0.93 | 0.93 | 0.88 | 0.81 | 0.70 | 0.58 | 0.50 | 0.58 | 0.46 | 0.39 | 0.28 | 0.23 |
| 30 mm · ca. 18 kg / m² · 500 mm | 0.65 | 0.79 | 0.87 | 0.72 | 0.75 | 0.69 | 0.60 | 0.60 | 0.67 | 0.62 | 0.63 | 0.61 | 0.62 | 0.60 | 0.60 | 0.50 | 0.44 | 0.36 | 0.40 |
Measured values as a table (2 measurements)
Access frequency bands, variants and export. Create a permanent free account
Last updated: