ASTM E413隔音等级的分类
日期:2012-02-08 11:00
36Single-number ratings are field sound transmission class (FSTC), noise isolation class (NIC), and normalized noise isolation class (NNIC).
1.3.3 Test Method E596The single-number rating is called noise isolation class (NIC).
1.3.4 Test Method E1414The 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.
2. Referenced Documents (purchase separately)
ASTM Sta
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