Mechanical Supplies

Damping Materials

About

Constrained-layer and free-layer damping compounds, sheets and tiles applied to sheet metal to convert flexural vibration into heat. Damping targets the ringing of thin panels, which is a different physical problem from transmission through a wall and is not improved by adding mass to the panel.

Application

Applied to duct walls downstream of high-pressure fans, to chiller and AHU casings, transformer tanks, chutes, hoppers and machine covers. It is the correct treatment for the drumming and low-frequency rumble that appears in large flat sheet metal surfaces, where lagging alone has no measurable effect because the panel is re-radiating from behind the lagging.

Standards & Reference 4 cited

ASTM E84
Surface burning characteristics: the flame spread index and smoke developed index a material is classified by. Class A is the usual requirement in an occupied building.

Also citedASTM E756ASTM D1000SAE J1637

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