FabricHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data
Value from the PTB table, not verified
Drapes, 2-layer, 1.7-fold gathered, 0.45 m from wall, B1 not easily flammable (series 2)
Type AV 12
PTB reference data
Original description
Drapes, 2-layer, 1.7-fold gathered, 0.45 m from wall, B1 not easily flammable (series 2)
Material properties
Manufacturer: mbakustik
Wall distance: 0.45 m
Up to fire class: B1 not easily flammable
Application: curtain
Mounting: in front of reverberation chamber wall
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 | 0.15 | 0.45 | 0.60 | 0.90 | 1.00 | 1.00 |
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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 | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 370g/m² · 0,45m | 0.75 | 0.09 | 0.14 | 0.24 | 0.35 | 0.47 | 0.57 | 0.52 | 0.58 | 0.73 | 0.85 | 0.87 | 0.95 | 0.96 | 0.99 | 1.01 | 1.03 | 1.06 | 1.07 |
Measured values as a table (1 measurement)
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