SilentPURE Sappa acoustic panel
SilentPURE Sappa acoustic panel
αw 0.45–0.60Absorber classes C, D
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.
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
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
Frequency values
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| Compare | Value | |
|---|---|---|
| 200 mm ceiling distance (suspended) | αw0.60 | |
| 0 mm (direct mounting on wall/ceiling) | αw0.45 |
Absorber class: C
Test report: 393067
Institute: Istituto Giordano S.p.A. (ACCREDIA LAB N° 0021 L, ISO/IEC 17025 akkreditiert)
Measurement date: 31/03/2022
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)
| Build-up | αw | 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 ceiling distance (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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