Mineral woolHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Armstrong Type 823 fissured mineral fiber, fire-resistant lay-in panel
Type 823
PTB reference data
Original description
Armstrong Type 823 fissured mineral fiber, fire-resistant lay-in panel
Material properties
Manufacturer: Armstrong World Industries
Thickness: 5/8 inch
Wall distance: 400 mm
Up to fire class: fire-resistant
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.61
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.35 | 0.35 | 0.50 | 0.80 | 0.85 | 0.85 |
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| Compare | Value | |
|---|---|---|
| 1.0 lb/ft² | αw0.61 | |
| 1.15 lb/ft² | αw0.61 |
Dimensions: 24 x 48 inches
Distance: 400 mm