Plaster & sprayHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Sound System Engineering, Don Davis and Carolyn Davis
Value from the PTB table, not verified
Sprayed Limpet asbestos, 3/4 inch, 1 coat, unpainted on solid backing
PTB reference data
Original description
Sprayed Limpet asbestos, 3/4 inch, 1 coat, unpainted on solid backing
Material properties
Thickness: 3/4 inch
Backing: solid backing
Surface: unpainted
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.70
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.20 | 0.70 | 0.90 | 0.95 | 0.85 |
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Value from the PTB table, not verified
NRC: 0.70 (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 |
|---|---|---|---|---|---|---|---|
| 3/4-in | 0.70 | 0.08 | 0.19 | 0.70 | 0.89 | 0.95 | 0.85 |
Measured values as a table (1 measurement)
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