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What are prepregs?

prepregs
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What are prepregs?

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A ‘prepreg’ is an epoxy coated glassfabric. It has two usages: as a dielectricum in multilayer PCBs, and as the raw material for FR4. 8 layers of ‘7628’ prepregs are used in one sheet of 1.60mm FR4. The central layer (no. 4) usually carries the red company/UL logo.

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