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Heavy Copper Printed Circuit Boards

The heavy copper PCB segment is a growing part of our production. In order to support this important segment, we are developing long-standing relationships with several factories which are carefully selected in our sourcing process.

    What is a heavy copper PCB?

    Double-sided printed boards are usually made of epoxy glass cloth copper foil. It is mainly used for communication electronics with high performance requirements Equipment, advanced instruments and electronic computers, etc.

    The production process of double-sided boards is generally divided into several methods, including process wire method, hole blocking method, masking method, and graphic electroplating etching method.

    Heavy copper inner layers improve thermal performance and current carrying capacity useful for applications like LED lighting, power electronics, and electric vehicle inverters.
    It is a PCB made with two or more conductive copper layers. The conductive foil appears to be thicker than on standard PCBs. The different inner layers are processed in pairs (on a core) and then bonded together using prepreg as the insulating layer. The layers are then placed in such a way that both sides of the PCB can be used to mount components with additional tracking/electrical connections on the inside of the board. Vias are used as a source of the electrical connections between the different layers of the PCB.
    More and more products are using heavy copper PCBs, for example EV-chargers, high current systems and power storage systems.


    AREX´s technical specification

    Number of layers

    4 – 22 layers standard, 30 layers advanced, 40 layers prototype, much depending on copper thickness.

    Technology highlights

    Multiple layers of epoxy glass fiber bonded together with multiple layers of copper of varying thicknesses.


    High performance FR4, halogen-free FR4

    Copper weights (finished)

    18-210µm, advanced 1050µm / 30 Oz

    Minimum track and gap

     0,075mm / 0,075mm (very much depending on copper thickness)

    PCB thickness

    0.40mm – 7.0mm, Min thickness depending on number of layers and copper thickness

    Maxmimum dimensions

    580mm x 1080mm, advanced 610mm x 1400mm

    Surface finishes available

    HASL (SnPb), LF HASL (SnNiCu), OSP, ENIG, Immersion Tin, Immersion Silver, Electrolytic gold, Gold fingers (HASL / LF HASL not recommended)

    Minimum mechanical drill