Research Article
The Effects of Various Additive Components on the Sound Absorption Performances of Polyurethane Foams
Table 2
Foam formulation and design.
| Main component | Group 1 | Group 2 | Group 3 | Group 4 | (parts by weight) | (parts by weight) | (parts by weight) | (parts by weight) |
| 3630 | 28 | 28 | 28 | 28 | 330N | 52 | 52 | 52 | 52 | MDI | 28.8 | 28.8 | 28.8 | 28.8 | Catalyst A1 | 0.04 | 0.04 | 0.04 | 0.04 | Catalyst A33 | 0.9 | 0.9 | 0.9 | 0.9 | Silicone | 0.9 | 0.9 | 0.9 | 0.9 |
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