Mineral woolLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data
Value from the PTB table, not verified
Ecophon Sombra D/gamma glass wool acoustic ceiling tile
Ecophon – Sombra D/gamma
PTB reference data
Original description
Ecophon Sombra D/gamma glass wool acoustic ceiling tile
Material properties
Manufacturer: Ecophon GmbH
Thickness: 4.7 in
Wall distance: 7.9 in
Surface: matte black dyed non-woven
Application: ceiling
Mounting: concealed sub-frame
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.30
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.60 | 0.25 | 0.20 | 0.40 | 0.25 | 0.20 |
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Value from the PTB table, not verified
NRC: 0.30 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 63 Hz | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|---|
| 120 mm · 4 kg / m² · tKh = 200 mm (totale Konstruktionshöhe) · Deckenplatten with geringem Lichtreflexionsgrad, z.B. for Kinos · mattschwarzes fleece | 0.30 | 0.80 | 0.60 | 0.25 | 0.20 | 0.40 | 0.25 | 0.20 |
Measured values as a table (1 measurement)
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