Zet Yapı

Makrolon Sound Protection

Bayer Makrolon

Excess noise and continuous, disturbing noise are harmful. That is why the effect of noise needs to be kept down to a minimum. Particularly relevant in this context are sound protection in residential buildings and the shielding of road noise (noise barrier walls). Depending on the type of noise source, its location with respect to the area to be protected and the path via which the sound is transmitted, various sound protection measures are needed. Basically, a distinction is made between measures aimed at sound absorption via sound dissipation – meaning that the acoustic energy is converted into other forms of energy (usually heat) – and those used for sound reduction via reflection of the sound waves. Makrolon® mono and multi sheets belong to the second category.

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Sound Reduction

A distinction is made between the mean sound reduction index, Rm, and the weighted sound reduction index, Rw.


Rm

Rm is determined according to DIN 52210, Part 1, i.e. the sound reduction is measured with respect to the frequency and then the rithmetic mean value is calculated.


Rw

For the practical assessment of the sound reduction, however, the "weighted sound reduction index", Rw, which takes account of the subjective effect for the various frequencies, is used.

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Subjective loudness Sound pressure level in
dB (A)
Noise source
Painful 140 Jet aircraft takeoff in immediate vicinity
Intolerable 120 Pneumatic hammer at 1 m
110 Night club
Extremely noisy 100 Motorcycle
Very noisy 90 Machine Shop
Moderately noisy 80 City motorway
70 Car traffic noise at approx. 50 km/h
Quiet 60 Office
50 Normal conversation
Very quiet 30 Whispering
20 Ticking of a clock
0 Threshold of hearing

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