Rhopac has provided material solutions for noise and vibration applications that range from concert speakers to automotive passenger compartments to industrial equipment. Many of these applications use foam as a primary component, due to its ability to act as an efficient sound absorber. Foam layers as thin as half an inch can absorb sound in the frequency range of 1200 to 7000 Hz. Applications can use thicker foam to absorb sound frequency as low as 500 Hz. When exposed to a noise source, the sound waves cause thin foam membranes to vibrate, converting the sound energy to heat energy. This dampens unwanted sound, solving the noise problem.
Rhopac can also manufacture acoustic products that combine a number of different materials. These combinations can include foam, rubber, or cork materials that will act as efficient barriers. These materials or composites are primarily used to contain low-frequency noise without adding excessive mass.