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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SilentPURE Sappa acoustic panel

Name: SilentPURE Sappa acoustic panel
Brand: SilentFiber

WallCeilingFree-hanging

Description

SilentPURE is a bio-based acoustic panel made from a moulded part of hemp fibres, lime and minerals. The open-pored mineral exposed surface makes the panel a visible wall and ceiling absorber for offices, meeting rooms, shopfitting and living spaces. Module formats 62.5 × 62.5 cm and 62.5 × 31.5 cm at 30 mm thickness (7.2 kg/m²). Two build-ups measured under accreditation: mounted directly on the wall or ceiling the panel reaches αw 0.45 (absorber class D), as a suspended ceiling with a 200 mm plenum αw 0.60 (class C), in each case with a full third-octave curve per DIN EN ISO 354 + ISO 11654 (Istituto Giordano). Nature-based raw materials: AgBB emission test passed, French VOC class A+, reprotoxic boron compounds < 0.1%.

Technical data

Material: Bio-based hemp-lime-mineral acoustic panel (moulded part of natural fibres and minerals)

Surface: open-pored, mineral exposed surface

Application: Wall and ceiling absorber as well as suspended ceiling / free-hanging ceiling raft

Certifications: AgBB emission test passed and French VOC class A+ (Bremer Umweltinstitut, test report K 8156 FM, 11.01.2019); manufacturer declaration: reprotoxic boron compounds < 0.1% by mass per CLP Regulation (EC) No 1272/2008

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 2 variants

α_w

0.60

Frequency values

α_p per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.20	0.50	0.60	0.55	0.70	0.80

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Compare			Value
	200 mm Deckenabstand (suspended)	Suspended ceiling / free-hanging ceiling raft with 200 mm ceiling void	α_w0.60
	0 mm (direct mounting on wall/ceiling)	Direkte Wall or ceiling mounting	α_w0.45

Absorber class: C

Test report: 393067

Institute: Istituto Giordano S.p.A. (ACCREDIA LAB N° 0021 L, ISO/IEC 17025 akkreditiert)

Measurement date: 2022-03-31

Room volume: 218.8 m³

Object area: 11.21 m²

Weight / density: 7,2 kg/m²

Dimensions: 62,5 × 62,5 cm / 62,5 × 31,5 cm

Measured values as a table (2 measurements)

SilentPURE Sappa 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
30 mm · 7,2 kg/m² · 0 mm (direct mounting on wall/ceiling) · Direkte Wall or ceiling mounting	0.45	D	0.08	0.10	0.11	0.14	0.17	0.23	0.28	0.35	0.50	0.59	0.76	0.93	1.01	0.91	0.71	0.66	0.72	0.79
30 mm · 7,2 kg/m² · 200 mm Deckenabstand (suspended) · Suspended ceiling / free-hanging ceiling raft with 200 mm ceiling void	0.60	C	0.11	0.20	0.33	0.40	0.55	0.56	0.66	0.61	0.52	0.47	0.51	0.69	0.67	0.76	0.73	0.80	0.82	0.79

Measured values as a table (2 measurements)

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Last updated: 17/09/2026