Researchers at the Swiss Federal Laboratories for Materials Science and Technology (EMPA) have developed an ultra-thin traffic noise absorber that significantly reduces sound levels while occupying just a fraction of the space required by traditional materials. This breakthrough, which could provide long-awaited relief for those living near busy streets, is based on a multi-layered mineral foam made from gypsum or cement. Each layer has pores of varying sizes, which alter the path of air particles, making sound dissipation more efficient than with flat insulation.
The material’s design allows it to be customized to address specific types of noise, making it adaptable for various indoor and outdoor environments. EMPA researchers have used numerical modeling to predict and optimize the acoustic performance of the material by adjusting pore sizes, perforation patterns, and layer thickness. This level of customization is a significant advancement over conventional noise-reduction methods.
During a real-world test in Zurich, the material was installed along a driveway that connects a busy street to a quieter courtyard. The results showed that traffic noise was reduced by up to 4 decibels, a noticeable improvement that can help mitigate the stress and health impacts of urban noise. The thin, dense panels also offer a practical benefit by minimizing space usage, allowing for greater flexibility in architectural and interior design applications, such as in residential or commercial settings where space is limited.
Additionally, the material is weather-resistant, fireproof, and made of recyclable components, enhancing its environmental appeal. The absence of harmful particles ensures its safety for indoor use in schools, offices, and apartments. However, challenges remain in the production process, particularly in the manual perforation technique, which limits scalability.
EMPA has partnered with Swiss manufacturer De Cavis to streamline production and enable broader commercial use. Once automated, the material could become a standard feature in construction projects where noise control is important. As cities grow and noise pollution becomes more prevalent, innovations like this offer a promising solution for improving quality of life. Although the product is not yet widely available, the progress toward commercialization suggests that quieter urban environments may be closer than previously anticipated.