Acoustic Solutions Acoustic Solutions Brochure - Page 7

Name Frequency Blind Usage  Acoustic Blind Fabric Soundcheck Blind  Acoustic Blind Fabric Width 330cm approx. 330cm approx. Pattern Repeat v – 18cm approx., h – n/a n/a Composition Trevira CS / Polyester Trevira CS / Polyester Flammability AS/NZS 1530 pt 2 AS/NZS 1530 pt 2 NRC Rating 0.57 0.62 Colours Available 2 3 Link www.materialised.com /products/frequency-blind www.materialised.com /products/soundcheck-blind Installation Instructions For optimum acoustic benefit, we recommend the blind be positioned 15 to 20cm from the window or wall. Fabric Care Mat 7. Dust regularly. Spot clean with a damp cloth. Do not wash. Do not dry clean. Acoustic Results – Sound Absorption Rates To quantify our fabrics as commercial acoustic solutions, each is tested and awarded an NRC (Noise Reduction Coefficient) rating. The NRC relates to the absorption effectiveness of the material, and is calculated by averaging how absorptive a material is at 4 different frequencies: 250hz, 500hz, 1000hz and 2000hz. Taking this average number, it is then applied it to the NRC scale of 0 to 1. A perfectly sound absorptive material achieves a 1, whereas a 0 indicates no absorption. With the fabric positioned approximately 15 to 20cm from the window or wall, researchers found that it could absorb up to five times as much sound as a typical lightweight fabric. At low frequencies, around 200hz, it absorbed no more than about a fifth of the incidental sound energy. However, at frequencies of about 500hz (human ears have a maximum sensitivity between about 3000-4000hz), the fabric absorbed about three quarters of the incidental sound energy. Frequency Hz Frequency Blind Soundcheck Blind 250 0.25 0.25 500 0.71 0.80 1000 0.69 0.76 2000 0.63 0.64 Mean Result 0.57 NRC 0.62 NRC