Coconut fiber roll felt, 29 mm, raw paper backed

PTB reference data

Original description

Material properties

Thickness: 29 mm

Surface weight: 2.2 kg/m²

Backing: raw paper faced

Flow resistance: 0.002 kPa·s/m²

ISO 354 – reverberation chamber

αw

0.31

αp nach ISO 11654

125 Hz

0.10

250 Hz

0.15

500 Hz

0.20

1000 Hz

0.35

2000 Hz

0.50

4000 Hz

0.55

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Method (354): Measured