WoodHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 158

Value from the PTB table, not verified

Wilhelmi Variantex 05 SAL wood fiber acoustic panel

Wilhelmi acoustic panel – Variantex 05 SAL (1981)

PTB reference data

Original description

Material properties

Manufacturer: Wilhelmi Werke AG

Thickness: approx. 18 mm

Wall distance: 50 mm, 300 mm

Surface: fine chip layer with fine-pored special lacquer coating

ISO 354 – reverberation chamber· 2 variants

α_w

0.60

α_p per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.30	0.65	0.80	0.55	0.60	0.70

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Compare		Value
	50 mm	α_w0.60
	300 mm	α_w0.60

Weight / density: 6 - 7 kg / m²

Measured values as a table (2 measurements)

Wilhelmi Variantex 05 SAL wood fiber acoustic panel: 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
ca. 18 mm · 6 - 7 kg / m² · 50 mm · Feinspanschicht with feinporiger Speziallackauflage	0.60	0.25	0.23	0.40	0.60	0.60	0.80	0.83	0.83	0.71	0.61	0.52	0.47	0.52	0.62	0.62	0.63	0.64	0.77
ca. 18 mm · 6 - 7 kg / m² · 300 mm · Feinspanschicht with feinporiger Speziallackauflage	0.60	0.80	0.68	0.75	0.75	0.84	0.72	0.67	0.62	0.54	0.48	0.53	0.58	0.60	0.63	0.60	0.54	0.55	0.68

Measured values as a table (2 measurements)

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Last updated: 02/09/2026