ASTM-E413 › Classification for Rating Sound Insulation
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1.1 This classification covers methods of calculating single-number acoustical ratings for laboratory and field measurements of sound attenuation obtained in one-third octave bands.
1.2 The name given to the single-number rating is assigned by the test method that invokes this classification.
1.3 Test methods that invoke this classification include:
1.3.1 Test Method The single-number rating is called sound transmission class (STC). —
1.3.2 Test Method Single number ratings are noise isolation class (NIC), normalized noise isolation class (NNIC), apparent sound transmission class (ASTC), and field sound transmission class (FSTC). —
1.3.3 Test Method The single-number rating is called noise isolation class (NIC). —
1.3.4 Test Method The single-number rating is called ceiling attenuation class (CAC). —
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
architectural acoustics; building design; ceiling attenuation class (CAC); field sound transmission class (FSTC); noise isolation class (NIC); normalized noise isolation class (NNIC); partitions (buildings); sound insulation rating; sound transmission class (STC);; ICS Number Code 91.120.20 (Acoustics in buildings. Sound insulation)
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April 1, 2016