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Epoxy resin that has been deposited on edges of copper in holes during drilling either as uniform coating or in scattered patches. It is undesirable because it can electrically isolate the conductive layers from the plated-through-hole interconnections.

PCB Glossary

  • Blister

    A localized swelling and separation between any of the layers of a laminated base material, or between base material or conductive foil. It is a form of Delamination.