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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.

PCB Glossary

  • First Article

    A sample part or assembly manufactured prior to the start of production for the purpose of ensuring that the manufacturer is capable of producing a product that will meet specified requirements.