Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Type 823
Original description
Armstrong Type 823 fissured mineral fiber, fire-resistant lay-in panel
ISO 354 – reverberation chamber· 2 variants
αp per ISO 11654
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| Compare | Value |
|---|---|
| αw0.61 | |
| αw0.61 |
Weight / density: 1.0 lb/ft²
Dimensions: 24 x 48 inches
Distance: 400 mm
