Plaster & sprayHighly absorbent
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
Mineral spray-on materials, 1.27 cm mineral fiber on metal lath, 2.54 cm airspace
PTB reference data
Original description
Mineral spray-on materials, 1.27 cm mineral fiber on metal lath, 2.54 cm airspace
Material properties
Thickness: 0.5 in
Wall distance: 1 in
Mounting: on metal lath
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.80
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.50 | 0.80 | 0.90 | 0.90 | 0.85 |
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Value from the PTB table, not verified
NRC: 0.80 (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 |
|---|---|---|---|---|---|---|---|
| 12,7 mm · 25,4 mm | 0.80 | 0.25 | 0.50 | 0.80 | 0.90 | 0.90 | 0.85 |
Measured values as a table (1 measurement)
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