Mineral woolHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Value from the PTB table, not verified
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
0.55
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 |
Create a permanent free account — Access frequency bands, variants and export.
Free. No password required.
| Compare | Value | |
|---|---|---|
| 1.0 lb/ft² | αw0.55 | |
| 1.15 lb/ft² | αw0.55 |
Dimensions: 24 x 48 inches
Distance: 400 mm
Measured values as a table (2 measurements)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 5/8 inches · 1.0 lb/ft² · 400 mm | 0.55 | 0.33 | 0.36 | 0.50 | 0.78 | 0.84 | 0.84 |
| 5/8 inches · 1.15 lb/ft² · 400 mm | 0.55 | 0.35 | 0.34 | 0.48 | 0.69 | 0.88 | 0.92 |
Measured values as a table (2 measurements)
Access frequency bands, variants and export. Create a permanent free account
Last updated: