Mineral fiber panel, surface-treated on both sides, 20 mm, spacing 50 mm

PTB reference data

Original description

Material properties

Thickness: 20 mm

Wall distance: 50 mm

Surface weight: 2.34 kg/m²

Density: 117 kg/m³

Flow resistance: 0.05 kPa·s/m²

Mounting: on 25 mm cross-battening

ISO 354 – reverberation chamber

α_w

0.60

α_p nach ISO 11654

f (Hz)	250	500	1k	2k	4k
α_p	0.30	0.70	0.95	0.90	0.80

Create a permanent free account — Access frequency bands, variants and export.

Free. No password required.

Value from the PTB table, not verified

Measured values as a table (1 measurement)

Mineral fiber panel, surface-treated on both sides, 20 mm, spacing 50 mm: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	α_w	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
20 mm · 117 kg/m^3, 2,34 kg/m^2 · 50 mm · Montiert on Kreuzlattung 25 mm, Air cavity 50 mm, Ränder der Prüffläche seitlich geschlossen · oberflächenimprägniert	0.60	0.13	0.18	0.28	0.45	0.55	0.72	0.87	0.93	0.94	0.93	0.92	0.89	0.83	0.81	0.83	0.80

Measured values as a table (1 measurement)

Access frequency bands, variants and export. Create a permanent free account

Last updated: 15/09/2026