Dear PCB experts,

We are designing a 10-layer PCB for a lethal voltage application. For safety
regulatory compliance, 2 of the insulation layers must be either double-layer
prepreg of any thickness or a prepreg/core of at least 0.4mm (0.016") pressed.
Their locations are between layer 3&4 and between layer 7&8. Can you tell me
whether the double-prepreg or the 0.4mm prepreg/core is more economical to make?

As additional information, all laminates are FR4. All inner layer circuits are
of 1oz copper while the 2 outer layers are of 2oz copper. The board size of
4"x8". Overall lay-up thickness must be within 0.090".

Thanks!

K.K. Chin
Artesyn Technologies,
Fremont, CA

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