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        <i class="icon-chevron-right"> What is EN ISO 11654?
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        <p>The EN ISO 11654 standard does not define any test. EN ISO 11654 is a standard that uses the results from an EN ISO 354 test to classify a sound absorbing foam. </p>
<p>Materials are classified into one of 6 categories (A, B, C, D, E and F) based on their overall weighted absorption coefficient αw. An absorbing foam will achieve a higher αw rating and a higher classification as the thickness is increased.</p>
<p>The weighted coefficient can only be calculated using results from an EN ISO 354 test. In all but 1 or 2 frequencies a material will have an absorption coefficient equal to or better than the weighted absorption coefficient (in some frequencies the performance may be much higher).</p>
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        <i class="icon-chevron-right"> What is ASTM C423?
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        ASTM C423 is an American standard that assesses how well an acoustic insulation absorbs noise in a reverberation room similar to EN ISO 354.
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        <i class="icon-chevron-right"> What is the Noise Reduction Class (NRC)?
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        <p>NRC is a single value that expresses the results of an ASTM C423 test in a single value. Although similar to the αw value calculated by EN ISO 11654 the method used to calculate the NRC value is slightly different and the two values cannot be compared directly.</p>
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        <i class="icon-chevron-right"> What is EN ISO 140-3?
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        <p>EN ISO 140-3 is a standard that defines a test method for sound barrier performance. </p>
<p>The test places the sound barrier over an opening between two reverberant rooms. A noise source is placed on one side of the barrier and decibel levels are measured on the other. The reduction is given as the sound reduction index. </p>
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        <i class="icon-chevron-right"> What is Rw?
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        <p>The results of the sound reductions measured in an EN ISO 140-3 test are given for each octave. These are most commonly combined together into a single weighted value – Rw – following the rules set down in ISO 717.</p>
<p>ISO 717 defines a series of reference curves for sound reduction. The measured sound reduction of a product must meet or exceed the reference curve with no more than a few exceptions.
   <strong>It is important to note that because of this two different products can have the same Rw value but very different performance. </strong></p>
<p>In general a product with a high Rw value will provide good sound barrier performance.</p>
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        <p>ISO 15665 is an international standard that specifies a test for acoustic systems on industrial process pipework and classifies systems based on the results. </p>
<p>The results from an ISO 15665 test are presented in the form of &#39;insertion loss&#39; values at each octave frequency band that show how many dB the system will reduce noise by at that frequency.</p>
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Not all acoustic tests are comparable - the most common are explained here.

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