What is a Measling? Measlings are discrete white spots or crosses below the surface of the base laminate that reflect a separation of fibers in the glass cloth at the weave intersection. Read More
What is a Mask? A mask is the material applied to enable selective etching, plating, or the application of solder to a PCB. Also called soldermask or resist. Read More
What is a Major Defect? A major defect is a defect that is likely to result in failure of a unit or product by materially reducing its usability for its intended purpose. Read More
What is a Lot Code? Some Customers require a manufacturer’s lot code to be placed on the board for future tracking purposes. Your order form is how you select it. A drawing can specify the location, what layer and i Read More
What is Liquid Photoimageable Soldermask (LPI)? An LPI is a mask sprayed on using photographic imaging techniques to control deposition. MCL standard is LPI-Green. Read More
What is a Line? A line is a thin conductive area on a PCB surface or internal layer usually composed of lands (to which component leads are connected) and paths (traces). Read More
What is a Legend? A legend is a format of lettering or symbols on the printed circuit board: e.g. part number, serial number, component locations, and patterns. See Nomenclature or Silk Screen. Read More
What is a Layup? Layup is the process in which treated prepregs and copper foils are assembled for pressing. Read More
