Manufacturer

Natural Acoustic

Natural Acoustic is a Tyrolean manufacturer of sound absorbers made from natural fibres, based in Mutters near Innsbruck. The main materials are sheep's wool, hemp, flax and wood fibre. The company provides reverberation measurement, planning and installation from a single source. The range includes acoustic panels, ceiling rafts and baffles made from hemp, hemp absorbers with flax fleece, sheep's wool and wood fibre absorbers, and the FRAMY frame absorbers for use as wall absorbers, room dividers or partitions. It also covers bass traps, wool room dividers, acoustic pictures and meeting pods. Areas of use are offices, hotels, restaurants and public buildings.

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Documents

Certificate (SHI)Product datasheet

Hemp Acoustic Panel

Name: Hemp Acoustic Panel
Brand: Natural Acoustic

Natural Acoustic Hemp Acoustic Panel

WallCeiling

Description

Acoustic panel made of Austrian industrial hemp and flax for closed wall and ceiling surfaces, single panels, grid ceilings and suspended ceiling rafts.

Technical data

Material: Hemp and flax with 15 % bicomponent fibre, 1 % ammonium phosphate as basic fire protection

Surface: Natural hemp, white glazed or coated in any RAL colour with a matt, water-based interior emulsion paint

Up to fire class: E (EN 13501-1), colour-coated D-s2,d0

Certifications: SHI product passport 15341-10-1000, tested for pollutants, with assessments for QNG and DGNB

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 3 variants

α_w

0.70

Frequency values

α_p per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.30	0.50	0.75	0.65	0.80	0.85

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Compare		Value
	200 mm distance to the ceiling	α_w0.70
	400 mm distance to the ceiling	α_w0.70
	0 mm (direct mounting)	α_w0.50

Absorber class: C

Measured values as a table (3 measurements)

Hemp Acoustic Panel: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	α_w	Absorber class	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
25 mm · 0 mm (direct mounting)	0.50	D	0.03	0.09	0.12	0.14	0.21	0.30	0.43	0.56	0.65	0.74	0.86	0.93	1.02	1.04	1.01	1.02	0.99	0.94
25 mm · 200 mm distance to the ceiling	0.70	C	0.35	0.21	0.31	0.37	0.50	0.60	0.66	0.82	0.75	0.66	0.60	0.68	0.78	0.77	0.82	0.82	0.86	0.87
25 mm · 400 mm distance to the ceiling	0.70	C	0.40	0.56	0.62	0.73	0.74	0.63	0.57	0.50	0.74	0.73	0.76	0.79	0.82	0.83	0.92	0.90	0.99	0.97

Measured values as a table (3 measurements)

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Last updated: 24/09/2026

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