ASTM Report
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Wovin Wall® Acoustic Wovin Wall has been tested to ASTM C 423-07a “Measurement of Sound Absorption in a Reverberation Chamber”. Achieving outstanding results, Wovin Wall is your interior Acoustic Solution. Wovin Wall is ideal for eliminating disturbing sound reflection from voices. It efficiently reduces the reverberation time (sound ”bouncing around”) in a room whether it be in a lobby area, corridor, cafeteria, restaurant, office or auditorium. Wovin Wall works by cutting down on the harsh echoes and empty ringing sounds coming from the walls can make a big difference. It will help quiet a busy area and make it more tolerable for everyone. Wovin Wall is an ideal acoustic solution due to it’s decorative nature and with the broad range of finishes available it can enhance any interior fit out both aesthetically and acoustically. Wovin Wall has been acoustically tested in varying combinations. We found that even the most basic timber Wovin Wall had an outstanding effect upon noise reduction. Noise and sound gets trapped behind the Wovin Wall tiles and cannot escape to bounce repeatedly around the room. The results particularly in the mid frequencies (vocal range) were exceptional with the results falling at up to 1 the Sabine Absorption Coefficient. Adding further options such as Sonex Acoustic Foam to the Wovin Wall will enhance the sound absorption. V 020608

ASTM C 423-07a gives a NRC (Noise Reduction Coefficient) result. An NRC measures how much sound is absorbed by Wovin Wall at a given size, in a given area over a broad range of frequencies. Materials receive a rating between 0 to 1, 1 being the optimum. The materials are tested at a broad range of frequencies as sound waves at differing frequencies, travel at varying speeds. Low Frequency = slow long waves High Frequency = fast short waves • Low Frequencies include ambient sounds in an interior such as air conditioning, printer and photocopier noise. • Medium frequencies (500 to 1000hz)...

Sabine Absorption Coefficients Freq, Wall "a" Wall "b" Hz 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 NRC 0.07 0.04 0.08 0.11 0.21 0.56 0.95 1.10 0.71 0.46 0.55 0.34 0.39 0.39 0.36 0.30 0.26 0.20 0.56 0. 0.07 0.08 0.17 0.21 0.41 0.93 1.13 1.10 0.87 0.83 0.75 0.63 0.59 0.60 0.55 0.50 0.44 0.37 0.72 Wall “a” – tiles, timber finish Wall “b” – tiles, timber finish with Sonex foam squares The NRC is calculated as an average of the Sabine Absorption Coefficients at 250, 500, 1000 and 2000 hz. 1.20 1.00 Wall "a" Sabine Absorp Coeff Wall "b" 0.80 0.60 0.40 0.20...