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ASTM International , 04/01/2016
Publisher: ASTM
File Format: PDF
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1.1This classification covers methods of calculating single-number acoustical ratings for laboratory and field measurements of sound attenuation obtained in one-third octave bands.
1.2The name given to the single-number rating is assigned by the test method that invokes this classification.
1.3Test methods that invoke this classification include:
1.3.1Test Method E90-The single-number rating is called sound transmission class (STC).
1.3.2Test Method E336-Single number ratings are noise isolation class (NIC), normalized noise isolation class (NNIC), apparent sound transmission class (ASTC), and field sound transmission class (FSTC).
1.3.3Test Method E596-The single-number rating is called noise isolation class (NIC).
1.3.4Test Method E1414-The single-number rating is called ceiling attenuation class (CAC).
1.4The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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