GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Dalenbäck, Datensatz der CATT-Software, November 2000. Data-Category in CATT: PLASTER9, C: Ceilings, D: Perf.
Value from the PTB table, not verified
Ceilings, perf. 27 mm gypsum board (16%), d = 4.5 mm 300 mm from ceiling (CATT: PLASTER9)
PTB reference data
Original description
Ceilings, perf. 27 mm gypsum board (16%), d = 4.5 mm 300 mm from ceiling (CATT: PLASTER9)
Material properties
Thickness: 1.1 in
Wall distance: 12 in
Perforation: 16%
Hole size: 0.2 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.75
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.45 | 0.55 | 0.60 | 0.90 | 0.85 | 0.75 |
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Value from the PTB table, not verified
NRC: 0.75 (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 |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.75 | 0.45 | 0.55 | 0.60 | 0.90 | 0.86 | 0.75 |
Measured values as a table (1 measurement)
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