Sound Insulation

The property of blocking the transmission of sound of a particular material.</p>
<p>There are several parameters used to measure and quantify sound insulation. In Europe the value R<font size=”1″>w</font> – weighted sound reduction index, is used as a measure of the sound insulation provided by a material under lab conditions. In the field situation where ‘flanking’ paths are apparent, the term D<font size=”1″>w</font> – the weighted level difference, is used.</p>
<p>In the USA the STC (Sound Transmission Class) and NIC (Noise Isolation Class) are used instead of R<font size=”1″>w</font> and D<font size=”1″>w</font> respectively.

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