Manufacturer

SilentFiber

SilentFiber offers a broad portfolio of sustainable acoustic elements made from natural fibres. The product family ranges from the peat-based SilentRoot acoustic panel through the hemp-based SilentHEMP line to specialty products such as SilentSPA (wet room), SilentMOSS (moss picture) and SilentBEE (hexagon). Owner Dipl. Ing. Robert Schwemmer operates as a brand owner with selected European manufacturing partners. Custom formats and individual cutting are available from the first panel onward (max. 1.2 × 2.4 m). Awards: Green Product Award 2022, Klimaschutzpreis (Climate Protection Prize), Austrian Bauherrenpreis, Green Product Award Finalist 2026.

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Documents

EPD Datasheet

SilentHEMP Hemp Acoustic Panel

Name: SilentHEMP Hemp Acoustic Panel
Brand: SilentFiber

EPD availableWallCeiling

Description

SilentHEMP is an ecological acoustic panel made from Austrian hemp (55 %) and flax (30 %), bonded with PET bicomponent fibre and a flame-retardant salt. The matte porous natural-fibre face combines visible acoustic surfaces with renewable raw materials, suited to residential spaces, offices, schools and kindergartens. Standard thickness 45 mm in six panel formats (42 × 42 up to 188 × 120 cm), eight standard colours plus RAL-like custom shades from a minimum order of 20 panels per colour. Chamfered edge on all sides, DIY installation is feasible. Standard fire class E per EN 13501-1, with additional flame-retardant treatment up to D-s2,d0. Climate footprint: GWP A1–A3 = -2.23 kg CO₂e/m² (net negative at the factory gate), 2.12 kg biogenic carbon/m². EPD per EN 15804+A2 (Kiwa-Ecobility Experts, valid until 03 Nov 2030). AgBB emission test passed (TVOC < 1000 µg/m³, formaldehyde 4 µg/m³).

Technical data

Material: Hemp-flax acoustic panel made from natural fibres

Surface: matt, porous natural-fibre face, eight standard colours

Up to fire class: Up to D-s2,d0 per EN 13501-1 (standard E, with additional flame-retardant treatment D-s2,d0)

Application: Residential spaces, offices, schools, kindergartens

Certifications: EPD per EN 15804+A2 (Kiwa-Ecobility Experts EPD-Kiwa-EE-000464-DE, valid until 03 Nov 2030), AgBB emission test passed (Holzforschung Austria 18343/2025-KW, TVOC < 1000 µg/m³, formaldehyde 4 µg/m³), REACH SVHC-free

Colours: 8 standard colours (Natural, Apricot, Green, Dark Grey, Light Grey, Off-white, Red, Gold); RAL-like custom shades available from a minimum order of 20 panels per colour

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 2 variants

NRC

0.90

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.20	0.45	0.90	1.00	1.00	1.00

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Compare		Value
	1.8 in	NRC0.90
	0.8 in	NRC0.50

NRC: 0.90 (derived from ISO 354 lab data)

Institute: SilentFiber

Distance: 0 in (direct mounting)

Measured values as a table (2 measurements)

SilentHEMP Hemp Acoustic Panel: 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
20 mm · 0 mm (direct mounting)	0.50	0.12	0.08	0.09	0.15	0.19	0.25	0.34	0.31	0.41	0.57	0.60	0.73	0.86	0.97	1.02	1.03	1.04	1.02

Measured values as a table (2 measurements)

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Last updated: 09/12/2026