Recycled polyester/ether foam that has been ground up and mixed with a type of adhesive. A cost-effective alternative. Its higher density than polyester/ether foam allows the material to absorb both high- and low-frequency sounds.
Popular as insulation in larger ventilation products, such as air-handling units, and as a sound absorber. It is available with a thin aluminum foil that protects the surface and provides greater temperature resistance.