Whatever it is, send it back.

Brian

Kevin Glidden wrote:
> We recently received a shipment of PCBs where the exposed outer layer
> laminate has staining that looks like copper. I have a photo -
> <http://tinyurl.com/yp9za2> http://tinyurl.com/yp9za2
> My question is what would cause this?  I've never seen it before, but I am
> thinking something in the Copper plating process.  The vendor is telling us
> it is staining but it is an asthetic issue only. What would cause it?  Is it
> an asthetic issue only?  It seems to me if the staining was caused by some
> plating chemistry, then it would effect the laminate properties,
> particularly the insulation resistance.
>  
> Thanks!
>  
> Kevin Glidden
> Manufacturing Engineer
> Luminescent Systems Inc.
>  
>  
>  
> 
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