Stiga RM
Sonablock FireSafe Wood Wool Acoustic Panel 25mm · 1.5mm fibre · A2-s1,d0
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Painted wood wool cement board (WWCB) acoustic panels, also known as fibrolite, made from sustainably sourced wood fibres bound with a higher proportion of Portland cement. Sonablock FireSafe 1.5mm is the Euroclass A2-s1,d0 non-combustible grade of the Sonablock range, for projects where the standard B-s1,d0 panel is not accepted. A sustainable, EU-made wood wool panel with a distinctive tactile texture.
The 1.5mm fibre gives the coarser, more tactile surface of the two FireSafe fibre sizes - well suited to schools, auditoriums, and public spaces where a visible wood wool texture is wanted alongside A2 fire performance.
Manufactured by Stiga RM - a PEFC-certified Latvian producer. Fire classification report issued by Kiwa (4243A / 1784 / 2026, July 2026).
Acoustic Performance
- Acoustic test data for the FireSafe grade is pending: this grade has not been tested yet, and the supplier expects the values to differ from the standard grade because of the higher cement content
- Indication only (standard B-s1,d0 grade, not FireSafe): αw 0.65 (Fiber 1.5 mm, ODS 200 mm) - Absorption Class C, tested per SS-EN ISO 354 / SS-EN ISO 11654 by RISE Research Institutes of Sweden (report O100282)
Fire Safety
- Euroclass A2-s1,d0 per EN 13501-1 - the non-combustible class
- Low smoke production (s1) · No flaming droplets (d0)
- Classification report by Kiwa: 4243A / 1784 / 2026 (July 2026)
- A2 is the non-combustible class typically required for escape routes, schools, hospitals, high-rise buildings and many public-building specifications where the standard B-s1,d0 panel is not accepted
- For comparison, the standard Sonablock range is classified B-s1,d0
Lead time
Made to order - standard production but not held in stock. Lead time about 4 weeks from order.
Technical Specifications
| Thickness | 25 mm |
| Fibre width | 1.5 mm |
| Reaction to fire | A2-s1,d0 (EN 13501-1, Kiwa 4243A / 1784 / 2026) |
| Panel sizes | 600×600 mm · 1200×600 mm |
| Weight | approx. 11 kg/m² (standard grade; FireSafe grade to be confirmed) |
| Thermal conductivity | λ 0.067–0.070 W/m·K (EN 13168) |
| Density | 445 kg/m³ |
| Max. relative humidity | 90% RH |
| Edge profiles | A24, B5, B11 |
| Designation | WW-EN13168-L4-W2-T2-S2-P2-Cl3 |
| Lead time | Made to order, about 4 weeks from order (not stocked) |
Available Colours
Supplied painted as standard: White RAL 9010 · Natural (RAL 1015) · Light Grey RAL 7035 · Dark Grey RAL 7004 · Black RAL 9011
Certifications
- Euroclass A2-s1,d0 per EN 13501-1, classification report by Kiwa (4243A / 1784 / 2026)
- CE marking per EN 13168:2012+A1:2015
- Declaration of Performance (DoP SB 1.1)
- PEFC Chain of Custody (BMCERT-PEFC-COC-00175, valid to Feb 2028)
- Environmental Product Declaration - EPD-IES-0031288 (valid to 2031)
- No added formaldehyde · REACH compliant
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