Increasing the surface area of STRATOCELL®WHISPER® FR panels

​The surface of STRATOCELL® WHISPER® FR panels, which we use as internal insulation of sound hoods for HVAC systems, were modified in a trial for optimized sound absorption and equipped with additionally punched and attached round Whisper molded parts. The punch hole served as an additional air cushion.
 
The die-cut and applied STRATOCELL® WHISPER® molded parts further improve the overall absorption of Whisper panels by increasing effective sound wave penetration and surface roughness. We used round WHISPER moulded parts with a diameter of 5 cm and a depth of 5.5 cm, which were punched directly from the panels.
These modifications improve sound absorption in the mid- and high-frequency ranges, as they allow for more angles of incidence for sound and promote resonances. The total NRC (Noise Reduction Coefficient) values of the panels increase by 10-20% according to our measurements, depending on hole diameter, depth and degree of coverage.
Absorption EffectsThe perforated or round punched parts increase absorption by directing sound waves into the porous polyethylene structure, which minimizes reflections. The attached elements act like diffusers that scatter sound waves to reduce echoes without significantly reducing the self-sustaining capacity of the panels.

Romolo Vicari / 08.01.2025