Board Processes and Technologies Single Sided PCB These are the simplest printed circuit boards. Single-sided printed circuits do not require plating through holes and have a circuit pattern only on one side. Double Sided PCB Double sided printed circuits are one step up from the single-sided PCBs in their complexity. When fabricating double-sided boards, through-holes are usually required between the top and bottom pads; these pads are connected using a special copper plating process commonly referred to as Plated Through Hole (PTH). This process and the resultant products allow interconnections between layers through all holes. Multilayer PCB Multilayer printed circuits consist of four or more circuit layers bonded together by a thickness of insulating material called prepreg and core. Hot Air Leveling (HAL) or HAL-lead free Solder Mask over bare copper (SMOBC) and HAL-lead free (RoHS) or 63/37 Tin-lead over copper is the final finish. Copper is exposed by solder mask, is coated by Hot Air Solder Leveling (HASL). Flash Gold Guaranteed for Ultrasonic Bonding, Ball Grid Array (BGA), Lead free and RoHs compliant materials, Extremely flat and uniform Thick Gold (contact / bonding) Gold fingers for contact purpose, Pads for rotary switch, Pads for Thermosonic Bonding, Lead free and RoHs compliant material Entek Lead free & RoHs compliant materials, Extremely flat & uniform Electroless Nickel Immersion Gold finish (ENIG) Contact surfaces. Minimum 1 micro-inch Gold over 100 micro-inch, Nickel Solderable surfaces, Electroless Nickel / Immersion Gold, Lead free and RoHs compliant materials, Extremely flat and uniform Preflux For Single Sided PCB's, Lead free and RoHs compliant materials We produce not only PCBs but also a wide array of products that will be perfect for your applications. We can provide your FR-1, FR-4, CEM-1, CEM-3, and all your other needs. Our standard printed circuit boards are 100% guaranteed in accordance with IPC-6012 and IPC-A600 class II standards. We are an ISO-9001:2008 company. Standard Printed Circuit Boards always provides the best possible precision quality and machining; we create world-class PCBs. Hole diameter, copper foil thickness, material length, and other specs are adhered to precisely. Other parameters of printed circuit boards of varying types are detailed below.