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Glass Fiber and Graphite Flake Reinforced Polyimide Composite Diaphragm for Loudspeakers

This paper describes a newly developed diaphragm material especially suitable for loudspeaker drivers. The new disphragm using this material features a high Young's modulus and an appropriate mechanical loss. The diaphragm is composed of a glass fiber fabric base with a polyimide matrix polymer and a flaked graphite filler. Young's modulus for the new diaphragm is ten times higher than that of commonly used paper pulp diaphragms, with about the same mechanical loss.

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