Heavy copper PCB is a circuit board with a copper thickness that is ≥ 3oz per sq. ft in its outer and inner layers. What makes a circuit board classified as a heavy copper PCB is its thicker plating. https://www.hitechpcba.com/heavy-copper-pcb-manufacturing
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Heavy Copper PCB Manufacturing--Hitechpcba

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Heavy copper PCB is a circuit board with a copper thickness that is ≥ 3oz per sq. ft in its outer and inner layers. What makes a circuit board classified as a heavy copper PCB is its thicker plating.

https://www.hitechpcba.com/heavy-copper-pcb-manufacturing