Rockwool / Stone Wool Slab Acoustic Properties \u2014 Absorption Coefficients (125Hz\u20134kHz)
Dense stone wool slab (40-140 kg/m³) for acoustic and thermal insulation. The highest-performing broadband absorber available. Used as the core material in most high-performance acoustic panels, baffles, and wall systems. Available unfaced or foil-faced.
Absorption Coefficients by Octave Band
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| α (absorption) | 0.25 | 0.70 | 0.95 | 1.00 | 1.00 | 1.00 |
RT60 Impact
Installing 20m² of 100mm Rockwool slab (unfaced) in a 100m³ room reduces RT60 by approximately 0.55s at 500Hz
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Frequently Asked Questions
What is the NRC of Rockwool / Stone Wool Slab?
Rockwool / Stone Wool Slab has an NRC (Noise Reduction Coefficient) of 0.95, calculated as the arithmetic mean of absorption coefficients at 250, 500, 1000, and 2000 Hz per ASTM C423.
Where is Rockwool / Stone Wool Slab typically used?
Rockwool / Stone Wool Slab is typically used as a wall cavity and ceiling void and free-standing absorber treatment. Dense stone wool slab (40-140 kg/m³) for acoustic and thermal insulation.
How much does Rockwool / Stone Wool Slab reduce RT60?
Installing 20m² of 100mm Rockwool slab (unfaced) in a 100m³ room reduces RT60 by approximately 0.55s at 500Hz
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