Stone Wool Sound Absorption
Open and porous by nature, the volcanic material provides superior sound absorption.
The fibrous structure of stone wool disrupts the movement of sound waves, allowing it to absorb excess noise and deliver acoustic comfort with incredible efficiency.
How sound is absorbed
Sound absorption occurs when a material converts sound waves into heat through friction in its pores.
Volcanic stone wool’s complex fibre structure traps sound in its air pockets, turning sound energy into tiny amounts of heat.
Trapped by air pockets
By reducing reflected sound, the high absorption helps sound fade faster, improving acoustic comfort.
The acoustically‑open surfaces of Rockfon solutions let sound pass into the stone wool core for effective absorption – and without the need for perforations.
Rockfon acoustic solutions
Ceilings and walls are two of the largest surfaces in interior spaces, making them assets in managing room acoustics.
Our tiles, panels, baffles and islands absorb sound where it matters most, often meeting targets without extra measures, while our dividers and screens support more flexible noise control.
Acoustic Parameters
Thanks to their stone wool core, Rockfon solutions meet and exceed all key acoustic parameters when installed correctly – supporting focus, well-being, hearing and vocal health, and contributing to compliance with acoustic regulations and building certifications.
Class A Classification
Sound absorbers are classified under the international standard EN ISO 11654 from Class A, the most absorbent and best-performing, to Class E, the most reflective. Because of their high αw value, most Rockfon ceiling tiles, wall panels, baffles, and zoning solutions are classified as Class A.
Reverberation Time
The most important factor in all acoustics regulations is reverberation time, defined as the time it takes for the sound pressure level to drop 60 dB below its original level. Rockfon solutions achieve and exceed the reverberation time thresholds set by regulations.
Speech Intelligibility
Closely linked to reverberation time, speech intelligibility measures how well speech can be heard and understood in a room. By reducing reflected sound, Rockfon stone wool solutions consistently achieve and exceed the recommended Speech Transmission Index, or STI.
Understanding sound absorption in three numbers
43.3 dB
75 dB
90%
FAQ
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Contact us*Bottalico, Pasquale, Ivano Ipsaro Passione, Simone Graetzer, and EricJ. 2017. “Evaluation of the Starting Point of the Lombard Effect.” Acta Acustica United with Acustica 103 (1): 169–72. https://doi.org/10.3813/aaa.919043 .
**Hearing Health Foundation. 2023. “Keep Listening | What Are Safe Decibels?” Hearing Health Foundation. Hearing Health Foundation. 2023. https://hearinghealthfoundation.org/keeplistening/decibels.