Frequency Damping Technology
Frequency Damping Technology (FDT) Damping material is notoriously ineffective, and even the use of dangerous glass fiber products can be found.
FDT vs Glass Fiber Damping Properties
125Hz 250Hz 500Hz 1000Hz 2Khz 4Khz NRC
Glass Fiber 0.17 0.20 0.72 0.99 1.01 1.09 0.81
FDT Fiber 0.97 1.37 1.23 1.08 1.02 1.01 1.15
Frequency Damping Technology (FDT) offers the highest NRC (sound
absorption) performance of any competitive material. Why? The answer
lies in the random thread diameter, length and orientation. The FDT
material is a Class A non-flammable material that is also resistant to
mold and mildew, and contains no chemical irritants and requires no
warning labels compared to the carcinogenic warnings that fiberglass is
required by law to display. FDT virtually eliminated any consideration
of the use of glass products, (runner up in the list of effective
damping materials), and performs incredibly well in the appropriate
highlighted frequencies (only low frequencies are issues).
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