Abstract
Vibration tests on small samples have been used to obtain the critical frequencies and loss factors of 7 mm, 9 mm and 11 mm laminated glass. The Sound Reduction Index (SRI) as a function of frequency has then been predicted using Sharp's method. The predictions have been compared with measured values of SRI obtained from reverberant room tests on 1·25 by 1·5 m windows. The predictions are good, particularly of the critical frequency and of R w . The measured SRI exceeds the mass law, possibly as a result of the relatively small window size in relation to the depth of the test aperture. The prediction method needs refining in the vicinity of the critical frequency.
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