| 摘要 |
A sound absorbing article is provided, produced by impregnating a pervious material with a coating, in a controlled manner, so as to increase the specific weight of the material by a controlled, predetermined factor, while maintaining the pervious nature of the material. As a consequence, the resistance to air flow through the material is increased The sound absorbing article is formed of materials which are flame retardant and environmentally friendly. The sound absorbing article may be optimized to a particular application and frequency range.
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