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In these heavy cooper PCBs are very demandable in market. Heavy Copper Printed Circuit Board (PCB) is 3 or more ounces of finished copper in the inner and/or outer layers. It is made using the process of Laminated Deposition.
The capability of heavy copper to survive frequent exposure if there is excessive current, elevated temperatures and recurring thermal cycling that can destroy a regular circuit board in seconds.
The high tolerance capacity of heavy copper makes it compatible with applications in rough situations such as, defense and aerospace industry products.
It is accepted if it the copper is 3 ounces ft2 to 10 oz per ft2 in the outer and inner layers.
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