Glass & transparentHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer's product sheet
Value from the PTB table, not verified
Kaefer Microsorber surface absorber, micro-perforated polyester film
Microsorber
PTB reference data
Original description
Kaefer Microsorber surface absorber, micro-perforated polyester film
Material properties
Manufacturer: Kaefer Isoliertechnik
Thickness: 0 in
Wall distance: 3.9 in
Perforation: micro-perforation
Hole size: 0 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.60
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.10 | 0.30 | 0.75 | 0.70 | 0.70 | 0.55 |
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Value from the PTB table, not verified
NRC: 0.60 (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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0,105 mm · 0,14 kg / m" · 100 mm · zweilagig / 30 mm Abstand zwischen den Folien | 0.60 | 0.06 | 0.07 | 0.10 | 0.21 | 0.29 | 0.45 | 0.65 | 0.78 | 0.77 | 0.75 | 0.67 | 0.62 | 0.68 | 0.70 | 0.69 | 0.64 | 0.59 | 0.47 |
Measured values as a table (1 measurement)
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