Akustik + Sylomer® acoustic hangers exceed the class A* recommendation of the German Acoustic Society DEGA.
The new recommendation number 103 of DEGA (2018) includes the higher quality class A* to designate the highest comfort level in noise reduction:
Table 3: Airborne noise reduction classes:
| Walls/Ceilings [R’w] | F | E | D | C | B | A | A* |
|---|---|---|---|---|---|---|---|
| <50 dB | ≥50 dB | ≥54 dB | ≥57 dB | ≥62 dB | ≥67 dB | ≥72 dB |
Table 4: Impact noise level classes:
| Walls/Ceilings [L’nw] | F | E | D | C | B | A | A* |
|---|---|---|---|---|---|---|---|
| >60 dB | ≤60 dB | ≤50 dB | ≤45 dB | ≤40 dB | ≤35 dB | ≤30 dB |
Source: DEGA Empfehlung 2018 (103), S.9
The tests carried out by IFT Rosenheim using the “AMC Acoustic Super T-60 + Sylomer® 30” acoustic hangers reached an airborne noise reduction level of Rw=82,3 dB and an impact noise level of Ln,w=30 dB.
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Because of this, both airborne noise reduction level and impact noise level allow the system to reach the highest quality class A*.
The use of a double ceiling suspended with AMC MECANOCAUCHO® Acoustic hangers provides the advantage of reaching high noise isolation values with the use of relatively low suspended mass.
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This creates new possibilities to fulfill the noise isolation regulations, specially for old buildings and those with wooden ceilings.
The Sylomer® Acoustic hangers have another important advantage when low frequencies are considered. In the last DAGA Acoustic congress which took place in Munich in 2018, one of the most important discussion points was that the regulation concerning the impact noise isolation (specially DIN 4109) is focused on frequencies above 100 Hz. However, frequencies below 100 Hz play an important role in impact noise isolation.
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Concerning this point, during the International Noise and Acoustic Days in 2011, Prof. Andreas Rabold carried out a study that showed the importance of low frequencies to properly evaluate the impact noise transmission. This can be achieved by the use of a correction factor (Ln,w + CI,50-2500) that increases the range to include frequencies between 50 and 100 Hz.
Considering frequencies under 100 Hz, the AMC MECANOCAUCHO® Acoustic Hangers show a very significant improvement in comparison with other tested systems, having a value of CI 50-2500 of only 10 dB.
AMC MECANOCAUCHO® offers a wide product range of different types of Acoustic Hangers, Wall ties and Floor mounts for an elastic “box in box” construction. This allows the selection of proper product for very different construction types.
More information can be found in www.akustik.com
