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Question:

To reach better sound absorption effect, which should be filled in the keel, glass wool felt / board or polyester fiber cotton felt / board ?

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Answer:

Glass wool board Glass wool board is mainly used for sound insulation. Glass wool felt is mainly used for thermal insulation, and polyester fiber cotton felt is mainly for thermal insulation and sound absorption.
Both materials are inappropriate to used for noise insulation, for glass wool and polyester fiber cotton are sound-absorbing materials. Neither is good for sound insulation. They can be used to prevent echo formation in the room, and their function is to reduce the reflection of sound indoors.

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