Single Float Glass Acoustic Properties \u2014 Absorption Coefficients (125Hz\u20134kHz)
Standard 6mm float glass in aluminium or timber frame. Highly reflective at mid-high frequencies with some low-frequency absorption from panel vibration. Double glazing has similar acoustic absorption performance.
Absorption Coefficients by Octave Band
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| α (absorption) | 0.18 | 0.06 | 0.04 | 0.03 | 0.02 | 0.02 |
RT60 Impact
Glass is primarily reflective. Large glazed facades increase RT60 significantly unless offset by ceiling/wall absorption
Manufacturers & Brands
Frequently Asked Questions
What is the NRC of Single Float Glass?
Single Float Glass 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 Single Float Glass typically used?
Single Float Glass is typically used as a wall (window) treatment. Standard 6mm float glass in aluminium or timber frame.
How much does Single Float Glass reduce RT60?
Glass is primarily reflective. Large glazed facades increase RT60 significantly unless offset by ceiling/wall absorption
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