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, non-combustible A1
PTB reference data
Original description
Scherff acoustic plaster, non-combustible A1
Material properties
Manufacturer: Scherff GmbH Co.KG
Thickness: approx. 0.5 in
Up to fire class: A1 (DIN 4102)
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.40
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.15 | 0.25 | 0.40 | 0.70 | 0.85 |
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Value from the PTB table, not verified
NRC: 0.40 (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. 12 mm · 3,5 kg / m² / cm | 0.40 | 0.04 | 0.15 | 0.26 | 0.41 | 0.69 | 0.84 |
Measured values as a table (1 measurement)
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