Plaster & sprayBroadband 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, thickness approx. 20 mm, non-combustible A1
PTB reference data
Original description
Scherff acoustic plaster, thickness approx. 20 mm, non-combustible A1
Material properties
Manufacturer: Scherff GmbH Co.KG
Thickness: approx. 0.8 in
Up to fire class: A1 (DIN 4102)
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.55
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.20 | 0.35 | 0.65 | 0.90 | 0.80 |
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Value from the PTB table, not verified
NRC: 0.55 (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. 20 mm · 3,5 kg / m² / cm | 0.55 | 0.05 | 0.18 | 0.34 | 0.66 | 0.92 | 0.79 |
Measured values as a table (1 measurement)
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