Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968, b2.1-12
Original description
Perforated gypsum cassette with mineral fiber inlay
ISO 354 – reverberation chamber· 2 variants
αp per ISO 11654
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| Compare | Value | |
|---|---|---|
| 344 mm | αw0.69 | |
| 74 mm | αw0.66 |
Dimensions: 625 x 625 mm
