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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Datasheet

Sheep Wool and Wood Fibre Absorber

Name: Sheep Wool and Wood Fibre Absorber
Brand: Natural Acoustic

Natural Acoustic Sheep Wool and Wood Fibre Absorber

WallCeilingFree-hanging

Description

Wall panel and ceiling raft made of Tyrolean sheep wool and wood fibre for offices, meeting rooms, hotels and restaurants.

Technical data

Material: Spruce frame, back panel of 0.12 in hardboard, optionally flame-retardant B-s1,d0

Surface: Tyrolean fulled felt, pure new wool (100 %) or wool with flax (75/25 %); printable and pinnable; covers available with flame-retardant finish to BS 7176 (medium hazard)

Up to fire class: E (EN 13501-1) for the absorber core

Certifications: Cover fabrics with EU Ecolabel and Indoor Air Quality Certified

Colours: Fulled felt in 3 colours, wool in 77 colours, wool with flax in 57 colours

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 6 variants

NRC

1.00

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.35	0.85	1.00	1.00	0.95	1.00

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			Value
2.6 in	0 in (direct mounting)	plane absorber	NRC1.00
4.1 in	0 in (direct mounting)	plane absorber	NRC1.05
2.6 in	17 in suspended	ceiling raft 47 × 47 in	A_obj2.50m²
2.6 in	7.3 in suspended	ceiling raft 47 × 47 in	A_obj2.20m²
2.6 in	3.3 in suspended	ceiling raft 47 × 47 in	A_obj2.10m²
2.6 in	0 in (direct mounting)	ceiling raft 47 × 47 in	A_obj1.70m²

NRC: 1.00 (derived from ISO 354 lab data)

Institute: Acoustics laboratory of Fuchs Raumingenieure, Nuremberg

Measurement date: 08/27/2024

Room volume: 13,829 cu ft

Object area: 133 sq ft

Measured values as a table (6 measurements)

Sheep Wool and Wood Fibre Absorber: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	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
2.6 in · 0 in (direct mounting) · plane absorber	1.00	0.18	0.33	0.50	0.63	0.92	0.98	1.07	1.10	1.12	1.07	1.05	0.98	0.94	0.96	0.99	1.01	1.00	0.99
4.1 in · 0 in (direct mounting) · plane absorber	1.05	0.39	0.45	0.80	0.96	1.02	1.04	1.09	1.12	1.05	1.02	0.97	0.98	1.00	1.02	1.00	1.03	1.03	1.04
2.6 in · 0 in (direct mounting) · ceiling raft 47 × 47 in (A_obj, m²)	–	0.50	0.70	0.80	1.40	1.60	1.80	2.10	1.90	1.90	1.80	1.70	1.60	1.60	1.50	1.70	1.70	1.70	1.70
2.6 in · 3.3 in suspended · ceiling raft 47 × 47 in (A_obj, m²)	–	0.50	0.70	0.80	1.50	1.80	2.20	2.60	2.40	2.30	2.20	2.10	2.10	2.00	1.80	1.90	2.00	1.90	1.90
2.6 in · 7.3 in suspended · ceiling raft 47 × 47 in (A_obj, m²)	–	0.50	0.70	0.90	1.60	1.90	2.10	2.50	2.30	2.20	2.20	2.30	2.20	2.10	2.10	2.20	2.20	2.20	2.20
2.6 in · 17 in suspended · ceiling raft 47 × 47 in (A_obj, m²)	–	0.60	0.70	1.00	1.70	1.80	1.80	2.00	2.20	2.40	2.40	2.50	2.60	2.60	2.50	2.50	2.60	2.60	2.70

Measured values as a table (6 measurements)

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Last updated: 09/24/2026

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