Answered by IPC Vice President – International Relations, David Bergman
Originally posted 12/23/09
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IPC Tech Question Online 
3 Comments
Excellent response.
I guess the item of significance is that if your contract reuqires the 600 for bare board you can use that? How about those cases where a back reference is used in the 610? Does that constitute the use of other standards for your completed assembly?
Thanks Michael,
One part of your question is easy. The other is a bit more complex. If you call out 610 and 610 references specific portions of another standard, only these specific portions would be part of the contract, not the entire document. And if you really want coverage of both specs you would be best to indicate that the assembly shall meet the requirements of 610 and 600. If you differentiate at this point by pointing to 610 for the assembly and 600 for the bare board, I think you open yourself up to the argument that the assembly is no longer a bare board so 600 doesn’t apply at this point. I guess that is when the contract lawyers get involved.
A follow up to my post that was brought to my attention. There are some conditions that are addressed in both 610 and 600. 600 requirements are in general tighter for these conditions than 610 as it is generally accepted that during harsh processing some degradation is expected. So if both documents are called out, you would need to establish some indication of precedence between the two otherwise you might find reasons for unnecessary rework. It is my understanding that the committee working on the latest revision to 610 (E Revision) are adding more clear pointers to 600.