The Effects of Various Additive Components on the Sound Absorption Performances of Polyurethane Foams

Figure 10

Curves of transmission loss of the PU foams of varying water contents and 141b. (a) Group 1 with water 3.8 parts by weight, (b) Group 2 with water 4.1 parts by weight, (c) Group 3 with water 4.4 parts by weight, and (d) Group 4 with water 4.7 parts by weight.