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2. Printed circuit board - Wikipedia

   en.wikipedia.org/wiki/Printed_circuit_board

   Printed circuit board of a DVD player. Part of a 1984 Sinclair ZX Spectrum computer board, a printed circuit board, showing the conductive traces, the through-hole paths to the other surface, and some electronic components mounted using through-hole mounting. A printed circuit board (PCB), also called printed wiring board (PWB), is a medium ...

3. Conformal coating - Wikipedia

   en.wikipedia.org/wiki/Conformal_coating

   Incorrect selection can affect long-term reliability of the circuit board as well as cause processing and cost problems. [9] The most common [citation needed] standards for conformal coating are IPC A-610 [10] and IPC-CC-830. [11] These standards list indications of good and bad coverage and describe various failure mechanisms, such as dewetting.

4. Flexible electronics - Wikipedia

   en.wikipedia.org/wiki/Flexible_electronics

   Flexible electronics, also known as flex circuits, is a technology for assembling electronic circuits by mounting electronic devices on flexible plastic substrates, such as polyimide, PEEK or transparent conductive polyester [1] film. Additionally, flex circuits can be screen printed silver circuits on polyester.

5. Pad cratering - Wikipedia

   en.wikipedia.org/wiki/Pad_cratering

   Pad cratering is a mechanically induced fracture in the resin between copper foil and outermost layer of fiberglass of a printed circuit board (PCB). It may be within the resin or at the resin to fiberglass interface. The pad remains connected to the component (usually a Ball Grid Array, BGA) and leaves a "crater" on the surface of the printed ...

6. Printed electronics - Wikipedia

   en.wikipedia.org/wiki/Printed_electronics

   Hanson proposed forming a Printed Circuit Board pattern on copper foil through cutting or stamping. The drawn elements were glued to the dielectric, in this case, paraffined paper. [66] The first printed circuit was produced in 1936 by Paul Eisler, and that process was used for large-scale production of radios by the USA during World War II.

7. FR-4 - Wikipedia

   en.wikipedia.org/wiki/FR-4

   FR-4 is a common material for printed circuit boards (PCBs). A thin layer of copper foil is typically laminated to one or both sides of an FR-4 glass epoxy panel. These are commonly referred to as copper clad laminates. The copper thickness or copper weight can vary and so is specified separately.