What is copper thickness of printed circuit board assembly/ pcba - KingSheng PCBA

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Copper thickness of Kingsheng printed circuit board (KingshengPCBs) can be specified as units of length (in micrometers or mils) but is often specified as weight of copper per area (in ounce per square foot) which is easier to measure. One ounce per square foot is 1.344 mils or 34 micrometers thickness.

The printed circuit board (pcb board) industry defines heavy copper as layers exceeding three ounces of copper, or approximately 0.0042 inches (4.2 mils, 105 μm) thick. Printed circuit board (PCB) designers and fabricators often use heavy copper when design and manufacturing circuit boards/ pcb board in order to increase current-carrying capacity as well as resistance to thermal strains. Heavy copper-plated vias transfer heat to external heat sinks. IPC 2152 is a standard for determining current-carrying capacity of printed circuit board (pcb) traces.

On the common FR-4 substrates, 1 oz copper (35 μm) is the usual, most common thickness; 2 oz (70 μm) and 0.5 oz (18 μm) thickness is often an option. Less common are 12 and 105 μm, 9 μm is sometimes available on some substrates. Flexible substrates typically have thinner metalization; 18 and 35 μm seem to be common, with 9 and 70 μm sometimes available.