Key advantages
• Broadband sound absorption (100 Hz–10 kHz)
• Significantly improves 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 combined with plasterboard systems and walls
Why this product
Whisper for indoor use offers a precise solution to reverberation and noise problems in interior spaces –
unlike standard materials, it is based on a closed-cell structure that delivers effective absorption without shedding fibres or wearing out over time.
Especially suited to architectural projects that demand high acoustic performance alongside a clean look and minimal maintenance.
Technical description
A professional acoustic panel based on expanded polyethylene (Closed Cell Polyethylene Foam), designed to absorb noise and reduce reverberation in interior spaces.
Its unique cellular structure absorbs sound waves 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 to:
ISO 354 (reverberation room)
Broad absorption across the mid–high frequency range
Significantly reduces reverberation
Partition sound insulation with 50 mm Whisper:
Up to Rw ≈ 37–41 dB (system-dependent)
Installation
• Installation on walls and ceilings
• Can be bonded with a dedicated adhesive
• Can be installed inside plasterboard framing
• Can be combined with coverings (fabric / plasterboard / boards)
• 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 sound absorption 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 (per test results)
ISO 9001 – Quality management system
