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A ratio of the PCB thickness to the diameter of the smallest hole.

PCB Glossary

  • CEM1 or CEM3

    PCB material, both CEM1 and CEM3 are epoxy/fiberglass over a paper core, differing only in the type of paper used. These materials are less expensive, more punchable substitutes for FR4. Not a military grade material.
    CEM stands for composite epoxy material.