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Frequencv (Hz) Figure 95 Sound reduction in a 122-mm-thick double-leaf lead/plasterboard partition (Partition #24) with mineral fiber infiH (broken line) compared with a 225mm concrete brick wall (solid line) [247]. (Courtesy of ILZRO and Dr. G. Kerry and P. Lord, Univ. of Salford, UK.)

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Frequency (Hz) Figure 96 Comparison of different composite sound-insulation materials: (a) Code 3 lead sheet (partition 2); (b) O.5-mm lead equivalent lead/PVC (partition II); (c) 6-mrn polyeurethane foam/Code 1 lead/6-mrn polyeurethane foam (partition 8); (d) Kemtech 5000 (partition 9); (e) Code 1 lead sheet (partition 1); (f) O.175-mm lead equivalent lead/PVC (partition 10) [247]. (Courtesy of ILZRO and Dr. G. Kerry and P. Lord. Univ. of Salford. UK.)