Copper Weight & Heavy Copper for Materials

Copper clad FR-4 laminate materials are measured using ounce (oz.) weight per square foot.

• 0.25 oz. = 0.00035” (8.75μm)
• 0.5 oz. = 0.0007” (17.5 μm)
• 0.75 oz. =0.00105” (26.25μm)
• 1.0 oz. = 0.0014” (35 μm)
• 2.0 oz. = 0.0028” (70 μm)
• 3.0 oz. = 0.0042” (105 μm)
• 4.0 oz. or more = 0.0056” (140 μm) or more

Heavier copper weights allow for higher current carrying capability and heat dissipation characteristics in high power designs, making heavy copper a common choice for automotive, power distribution, and welding equipment industries . Hopetimepcb Electronics is capable of fabricating multi -layer PCB boards with a maximum copper weight of 10 oz. Copper weight of 4 oz. or higher will require an additional estimate, and may also affect lead times. The specified copper weight for a board will also impact the trace width and spacing requirements of the board, as shown in Table 5, below:

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