Plaster & sprayHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data www.knauf.de
Value from the PTB table, not verified
Knauf P 142 acoustic plaster, gypsum-bound
Knauf Akustikputz – P 142
PTB reference data
Original description
Knauf P 142 acoustic plaster, gypsum-bound
Material properties
Manufacturer: Knauf Headquarters Iphofen
Wall distance: 0 in, 2.4 in
Up to fire class: A1
Application: ceiling
Mounting: directly on solid ceiling; on gypsum board ceiling facing
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.35
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.10 | 0.25 | 0.45 | 0.70 | 1.00 |
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| Compare | Value | |
|---|---|---|
| 0, direkt on Massivdecke | NRC0.35 | |
| 2.4 in, on Deckenbekleidung from Gipsplatten | NRC0.40 |
NRC: 0.35 (derived from ISO 354 lab data)
Weight / density: ca. 3 kg / m² at 0.6 in Schichtdicke
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ca. 3 kg / m² at 15 mm Schichtdicke · 0, direkt on Massivdecke | 0.35 | 0.03 | 0.04 | 0.04 | 0.06 | 0.09 | 0.12 | 0.19 | 0.24 | 0.31 | 0.37 | 0.43 | 0.52 | 0.61 | 0.72 | 0.81 | 0.98 | 1.06 | 1.01 |
| ca. 3 kg / m² at 15 mm Schichtdicke · 60 mm, on Deckenbekleidung from Gipsplatten | 0.40 | 0.11 | 0.19 | 0.17 | 0.17 | 0.15 | 0.15 | 0.18 | 0.21 | 0.25 | 0.33 | 0.42 | 0.50 | 0.60 | 0.72 | 0.81 | 0.99 | 1.01 | 1.03 |
Measured values as a table (2 measurements)
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