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Conductive Corrugated Boxes

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#58968

Conductive Corrugated Boxes | 2 June, 2009

Hello,

I have searched endlessly to get a good description of how these are manufactured and exactly how they are supposed to work. I have yet to find anything comprehensive. Our CEM ships our PCBs to us in plain cardboard boxes with Conductive Corrugated Dividers inside to seperate the PCBs. There is a piece of Conductive Corrugated cardboard across the top and bottom of the inside of the box. So the PCBs are surrounded by this material, but it is not creating a continuous solid outer shield. The outside surface of the Conductive Corrugated material dividers would act as the shielding. However, it touches the bottom of the top piece of Conductive Corrugated material which in turn comes in direct contact with the PCBs. I am thinking that this configuration is not acceptable and that the entire outside of the shipping box should be covered with the conductive coating to create a faraday cage. I am not entirely sure that this would create a faraday cage. The cardboard itself is an insulator correct, but can still hold a charge? You wouldn't want one side of the Conductive Corrugated material to contact the other or the shield is compromised right?. Am I thinking of this correctly? How effective is this material in protecting PCBs from ESD during shipping, handling, etc...? I would prefer that each PCB be placed in its own ESD shielded bag and shipped in a regular cardboard box with regular cardboard dividers.

Thanks, B

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#59034

Conductive Corrugated Boxes | 9 June, 2009

We don't know the answer to your question, but this paper may help point you in the correct direction http://www.hp.com/packaging/misc/Presentation/AHPStudy.pdf

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#59042

Conductive Corrugated Boxes | 10 June, 2009

I don't know exactly what you are saying about the configuration of the shipping container, but as long as the pcbs are seperated from the inside non-conductive box, it's fine. The pcbs touching the conductive corrugated box won't hurt anything. That's acceptable (It's the same thing if they were shipping in anti-static bags.). As far as the Faraday cage, I don't see any use for this in shipping. The cage is used primarily in testing environments. We use one for testing wireless RF devices.

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