Double Glazed Unit (IGU) Acoustic Properties \u2014 Absorption Coefficients (125Hz\u20134kHz)
Insulated glass unit (IGU) with two panes and gas-filled cavity. Thermal performance is excellent but acoustic absorption is minimal. The sealed air cavity provides some low-frequency panel absorption but mid-high frequency performance is essentially reflective.
Absorption Coefficients by Octave Band
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| α (absorption) | 0.15 | 0.05 | 0.04 | 0.03 | 0.02 | 0.02 |
RT60 Impact
Double glazing is primarily reflective. Large glass facades require compensating ceiling/wall absorption to control RT60
Manufacturers & Brands
Frequently Asked Questions
What is the NRC of Double Glazed Unit (IGU)?
Double Glazed Unit (IGU) has an NRC (Noise Reduction Coefficient) of 0.10, calculated as the arithmetic mean of absorption coefficients at 250, 500, 1000, and 2000 Hz per ASTM C423.
Where is Double Glazed Unit (IGU) typically used?
Double Glazed Unit (IGU) is typically used as a wall (window) treatment. Insulated glass unit (IGU) with two panes and gas-filled cavity.
How much does Double Glazed Unit (IGU) reduce RT60?
Double glazing is primarily reflective. Large glass facades require compensating ceiling/wall absorption to control RT60
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