Key advantages
• Broadband sound absorption (100 Hz–10 kHz)
• Significant improvement in interior acoustics
• Reduces reverberation (echo) and reflected noise
• Lightweight material, easy to install
• High long-term durability
• Does not crumble or shed fibres
• Suitable for sensitive spaces (museums / studios)
• Can be integrated with plasterboard systems and walls
Why this product
Whisper for indoor use provides a precise solution to reverberation and noise problems in enclosed spaces –
unlike standard materials, it is based on a closed-cell structure that enables effective absorption without shedding fibres or wearing out over time.
Particularly suitable for architectural projects that require high acoustic performance alongside a clean appearance and minimal maintenance.
Technical description
A professional acoustic panel based on closed-cell polyethylene foam, designed to absorb sound and reduce reverberation in interior spaces.
The unique cellular structure enables sound waves to be absorbed across a wide frequency range, while maintaining mechanical stability and long-term durability.
In addition, the material does not absorb moisture or crumble, making it suitable for long-term use even in sensitive environments.
Applications
• Recording studios
• Meeting rooms
• Offices
• Commercial spaces
• Museums and galleries
• Showrooms
• Home cinema rooms
• Spaces with reverberation problems
Technical specifications
Material: closed-cell polyethylene foam (LDPE)
Density: approx. 25 kg/m³
Common thicknesses: 25 / 50 mm
Operating temperature: -60°C to +80°C
Moisture resistance: does not absorb water
Structure: closed-cell
Acoustic performance
Sound absorption coefficient tested in accordance with:
ISO 354 (reverberation room)
Broad absorption in the mid–high frequency range
Significant improvement in reducing reverberation
Partition sound insulation with 50 mm Whisper:
Up to Rw ≈ 37–41 dB (depending on the system)
Installation
• Wall and ceiling installation
• Can be bonded with a dedicated adhesive
• Can be installed within plasterboard framing
• Can be combined with coverings (fabric / plasterboard / panels)
• Edge-to-edge joining for a uniform surface
Performance table
Standards Institution of Israel 755 STRATOCEL WHISPER (1)
Whisper FR TDS 2023 (English UK) – technical specifications
Airborne sound transmission through partitions – test
Whisper 50 resonance test in a reverberation room
Standards
EN ISO 354 – Measurement of sound absorption in a reverberation room
EN ISO 10140 – Sound insulation between spaces
EN ISO 717 – Rating of sound insulation
EN 13501-1 – Reaction to fire
B-s2,d0 (based on test results)
ISO 9001 – Quality management system
