WoodBroadband absorber

Physikalisch-Technische Bundesanstalt

Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 84

Value from the PTB table, not verified

Deweton acoustic panel Type D (Helmholtz resonator), 4 mm slots

PTB reference data

Original description

Material properties

Manufacturer: Danzer Furnierwerke GmbH

Thickness: 25 mm

Wall distance: 30 mm

Perforation: 4 mm wide slots on visible side at 34 mm spacing

Hole size: 12 mm diameter (tube)

ISO 354 – reverberation chamber· 3 variants

α_w

0.45

α_p per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.30	0.25	0.35	0.55	0.85	0.55

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Weight / density: 11 kg / m²

Dimensions: width 604 mm, Längen: 604 mm, 1212 mm, 1820 mm, 2500 mm, 3000 mm.

Application: Wand- and Deckenplatte

Distance: 30 mm

Measured values as a table (3 measurements)

Deweton acoustic panel Type D (Helmholtz resonator), 4 mm slots: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	α_w	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
25 mm · 11 kg / m² · 30 mm · Wand- and Deckenplatte · Spezialspanplatte beidseitig furniert and mattiert	0.35	0.18	0.23	0.26	0.25	0.18	0.17	0.20	0.23	0.30	0.40	0.53	0.70	0.90	1.03	1.06	0.85	0.63	0.53	0.55
25 mm · 11 kg / m² · 30 mm · Wand- and Deckenplatte · Spezialspanplatte beidseitig furniert and mattiert	0.45	0.26	0.28	0.30	0.26	0.25	0.24	0.30	0.35	0.43	0.48	0.58	0.63	0.70	0.86	1.00	0.80	0.50	0.35	0.36
25 mm · 11 kg / m² · 30 mm · Wand- and Deckenplatte · Spezialspanplatte beidseitig furniert and mattiert	0.35	0.15	0.19	0.32	0.40	0.30	0.25	0.32	0.31	0.31	0.29	0.30	0.35	0.45	0.57	0.68	0.55	0.36	0.20	–

Measured values as a table (3 measurements)

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Last updated: 02/09/2026