Plaster & sprayHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data online at www.scherff.de
Value from the PTB table, not verified
Scherff acoustic plaster, flattened surface, approx. 10 mm
PTB reference data
Original description
Scherff acoustic plaster, flattened surface, approx. 10 mm
Material properties
Manufacturer: Scherff GmbH Co.KG
Thickness: approx. 0.4 in
Surface: flattened
Up to fire class: A1 (DIN 4102)
Application: walls
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.50
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.35 | 0.25 | 0.30 | 0.65 | 0.75 | 0.90 |
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Value from the PTB table, not verified
NRC: 0.50 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| ca. 10 mm · 3,5 kg / m² / cm · Oberfläche geplattet (for Wände) | 0.50 | 0.37 | 0.26 | 0.32 | 0.66 | 0.74 | 0.89 |
Measured values as a table (1 measurement)
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