What is Copper (Finished Copper)

By Bester PCBA

Last Updated: 2023-11-14

What is Copper (Finished Copper)

Copper (finished copper) refers to the final thickness of the copper layer on a printed circuit board after the manufacturing process is complete, which determines the electrical performance and reliability of the PCB.

The finished copper thickness is measured in ounces per square foot (oz/ft2) and can vary based on the specific requirements of the customer and industry standards. The context highlights the use of different copper weights, such as 0.5 oz, 1 oz, and 2 oz, which serve as starting points before the plating process.

The IPC-6012 standard, a qualification and performance standard for rigid PCBs, provides guidelines for the minimum required copper thickness. It specifies the target thickness for the foil manufacturer, allowable tolerances, and reductions during the manufacturing process.

The finished copper thickness can impact the overall cost of the PCB. Achieving the desired thickness within the specified tolerances requires careful consideration of factors such as base copper weight, plating thickness, and process reduction.

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