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.
Documents
Hemp Ceiling Raft
Natural Acoustic Hemp Ceiling Raft
Description
Ceiling raft made of Austrian industrial hemp and flax for offices, open-plan offices and meeting rooms.
Technical data
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 3 variants
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.45 | 0.90 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | |
|---|---|---|
| 0 in (direct mounting) | NRC0.90 | |
| 39 in suspended | Aobj3.65m² | |
| 20 in suspended | Aobj3.45m² |
NRC: 0.90 (derived from ISO 354 lab data)
Measured values as a table (3 measurements)
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.8 in · 0 in (direct mounting) · plane absorber | 0.90 | 0.16 | 0.21 | 0.25 | 0.34 | 0.41 | 0.60 | 0.79 | 0.92 | 1.02 | 1.10 | 1.16 | 1.11 | 1.11 | 1.05 | 1.05 | 1.05 | 1.04 | 1.02 |
| 1.8 in · 20 in suspended · ceiling raft 74 × 47 in (Aobj, m²) | – | 0.90 | 1.30 | 1.70 | 1.90 | 2.10 | 2.20 | 2.10 | 2.60 | 2.90 | 3.10 | 3.50 | 3.70 | 3.90 | 4.10 | 4.10 | 4.20 | 4.30 | 4.40 |
| 1.8 in · 39 in suspended · ceiling raft 74 × 48 in (Aobj, m²) | – | 1.00 | 1.30 | 1.40 | 1.40 | 1.80 | 2.30 | 2.40 | 2.80 | 3.10 | 3.40 | 3.60 | 3.90 | 4.20 | 4.40 | 4.40 | 4.50 | 4.50 | 4.70 |
Measured values as a table (3 measurements)
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