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Manufacturing PCBs: Ensuring Global Consistency

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MWagner_MA
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IPC-4101/ Good fab drawing go a long way to help
MWagner_MA   11/17/2016 7:31:00 AM
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This is more a problem when you cross the line into designs requiring controlled impedance traces.  Otherwise specifying a laminate from the IPC-4101 standard helps to limit your choices of laminant, and thus variation at your supplier.  Also you should be somewhat specific about your desired inter-plane spacing so that you get consistancy between suppliers.  If you don't spec  it, you may get wildly different spacings. This spec should be reviewed with your primary supplier given the % copper area on each layer (extracted from your gerber files or other tool) prior to release to insure the spacing can be met.

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