GypsumHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data www.knauf.de
Value from the PTB table, not verified
Knauf D 127 acoustic panel, square-hole block pattern 12/25Q, ball-impact resistant
D 127 block-pattern perf. with square holes 12/25Q Design B4
PTB reference data
Original description
Knauf D 127 acoustic panel, square-hole block pattern 12/25Q, ball-impact resistant
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in
Wall distance: 16 in, 2.4 in
Perforation: 17.7%
Hole size: 12/25 Q
Backing: incl. S...
Surface: perforated
Mounting: on a substructure
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.65
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.60 | 0.85 | 0.65 | 0.60 | 0.55 | 0.45 |
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| Compare | Value | |
|---|---|---|
| 16 in | NRC0.65 | |
| 2.4 in | NRC0.60 |
NRC: 0.65 (derived from ISO 354 lab data)
Weight / density: <15 kg / m²
Dimensions: 47 in x 94 in
Measured values as a table (2 measurements)
| Build-up | NRC | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12,5 mm · <15 kg / m² · 400 mm | 0.65 | 0.39 | 0.55 | 0.86 | 0.84 | 0.83 | 0.84 | 0.60 | 0.63 | 0.65 | 0.65 | 0.62 | 0.57 | 0.59 | 0.55 | 0.49 | 0.45 | 0.45 |
| 12,5 mm · <15 kg / m² · 60 mm | 0.60 | 0.05 | 0.12 | 0.08 | 0.26 | 0.31 | 0.60 | 0.72 | 0.72 | 0.83 | 0.92 | 0.82 | 0.71 | 0.60 | 0.50 | 0.35 | 0.40 | 0.41 |
Measured values as a table (2 measurements)
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