Reference surfaceLow absorption
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Harris:Handbook of Acoustical Measurements and Noise Control, McGraw Hill 1991
Value from the PTB table, not verified
Plaster, gypsum, or lime, smooth finish on lath
PTB reference data
Original description
Plaster, gypsum, or lime, smooth finish on lath
Material properties
Surface: smooth
Mounting: on lath
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.05
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.10 | 0.05 | 0.05 | 0.05 | 0.05 |
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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 |
|---|---|---|---|---|---|---|---|
| on lath · smooth finish | 0.05 | 0.14 | 0.10 | 0.06 | 0.04 | 0.04 | 0.03 |
Measured values as a table (1 measurement)
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