Acoustic IndexAcoustic Index

SilentHEMP Hemp Acoustic Panel

SilentHEMP Hemp Acoustic Panel

αw 0.40–0.75Absorber classes C, D

EPD availableWallCeiling
With a free account

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.

All products by this manufacturerManufacturer website

Documents

EPDDatasheet

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, AgBB emission test passed, REACH-SVHC-free
Colours: 8 standard colours, custom colours from 20 panels per colour

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 2 variants

αw
0.75

Frequency values

Create a permanent free account. Access frequency bands, variants and export.

Free. No password required.

CompareValue
45 mmαw0.75
20 mmαw0.40

Absorber class: C

Institute: SilentFiber

Distance: 0 mm (direct mounting)

Terms of use
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-upαwAbsorber class100 Hz125 Hz160 Hz200 Hz250 Hz315 Hz400 Hz500 Hz630 Hz800 Hz1000 Hz1250 Hz1600 Hz2000 Hz2500 Hz3150 Hz4000 Hz5000 Hz
20 mm · 0 mm (direct mounting)0.40D0.120.080.090.150.190.250.340.310.410.570.600.730.860.971.021.031.041.02
Measured values as a table (2 measurements)

Access frequency bands, variants and export. Create a permanent free account

Last updated:

Calculate reverberation time with this product