| 摘要 |
Prodn. of a sound insulating part (1) having a Youngs modulus less than 500 MPa, being air tight and with a surface specific mass greater than 1 Kg/m<2> consists of injecting into a mould (2) a known quantity of material (4) consisting of a thermoplastic or thermo set and fillers representing pref. more than 50 wt. % of injected material and having a density greater than 2. Also claimed are the parts obtained.
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