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 metal lath
PTB reference data
Original description
Sprayed Limpet asbestos, 3/4 inch, 1 coat, unpainted on metal lath
Material properties
Thickness: 3/4 inch
Surface: unpainted
Mounting: on metal lath
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.90
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.40 | 0.90 | 0.90 | 0.90 | 0.90 | 0.80 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 3/4-in | 0.90 | 0.41 | 0.88 | 0.90 | 0.88 | 0.91 | 0.81 |
Measured values as a table (1 measurement)
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