Carpet, loop pile, on felt underlay
NRC 0.50
PTB reference data
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Reference surfaceHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: DNA-Tabelle 1968 a 6-4
Value from the PTB table, not verified
Original description
Carpet, loop pile, on felt underlay
Material properties
Thickness: 0.21 in
Surface weight: 0.41 lb/ft²
Backing: felt underlay
Surface: waffle structure
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.50
derived from ISO 354 lab data
Frequency values
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Value from the PTB table, not verified
NRC: 0.50 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| 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 | 5000 Hz | 6300 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.21 in · 1.3 lb/ft^2 · verlegt on Filzunterlage, 0.31 in thick, 0.93 lb/ft^2, 36 Rayl. with Waffelstruktur on Oberseite · Schlingenwebart | 0.50 | 0.05 | 0.04 | 0.13 | 0.08 | 0.10 | 0.15 | 0.20 | 0.31 | 0.45 | 0.58 | 0.70 | 0.85 | 0.90 | 0.93 | 0.85 | 0.80 | 0.74 | 0.70 | 0.62 |
Measured values as a table (1 measurement)
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