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 slotline B5 slotted gypsum board
D 127 slotline B5
PTB reference data
Original description
Knauf D 127 slotline B5 slotted gypsum board
Material properties
Manufacturer: Knauf Hauptverwaltung Iphofen
Thickness: 0.5 in + 0.8 in mineral fiber
Wall distance: 16 in, 2.4 in
Perforation: 10.9%
Backing: mineral fiber
Surface: slotted
Mounting: on sub-frame
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 | 0.65 | 0.80 | 0.65 | 0.65 | 0.40 | 0.35 |
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| Compare | Value | |
|---|---|---|
| 16 in | NRC0.65 | |
| 2.4 in | NRC0.65 |
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 + 20 mm Mineralfaser · <15 kg / m² · 400 mm | 0.65 | 0.55 | 0.57 | 0.84 | 0.87 | 0.84 | 0.70 | 0.67 | 0.65 | 0.70 | 0.66 | 0.64 | 0.58 | 0.46 | 0.42 | 0.39 | 0.37 | 0.36 |
| 12,5 mm + 20 mm Mineralfaser · <15 kg / m² · 60 mm | 0.65 | 0.20 | 0.30 | 0.38 | 0.62 | 0.69 | 0.84 | 1.00 | 0.94 | 0.90 | 0.75 | 0.64 | 0.50 | 0.40 | 0.38 | 0.34 | 0.33 | 0.32 |
Measured values as a table (2 measurements)
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