I wrote that????? I must have been bonkers! Anyway, flattery will get
you everywhere! :-D

Seriously, 20 years later, I still stand by these arbitrary guidelines.

Brian (the unwise non-guru)

Ingemar Hernefjord (KC/EMW) wrote:
> Hi,
>
> I refer to guru Ellis's book, which one is my 'cleanliness bible'.
>
> 1. Industrial non-aerospace/military with conventional components : 2
> ug/sqcm NaCl
>
> 2. Like the above but with SMCs : 1.5 ug/sqcm NaCl
>
> 3. Aerospace/military with ultra high impedance requirements : 1 ug/sqcm
> NaCl
>
> 4. Hybrid circuits : 0.5 ug/sqcm NaCl
>
> 5: wafer manufacturing/handling level:  ??
>
> It is interesting to see what wise Brian writes in his comments to these
> levels: "Let it be said that the choice of any given limit level value
> is arbitrary...."  So, the discussions about fractions of micrograms up
> or down may be of only academic interest, but meaningless in industry
> daily life.
>
> Ourselves, we prefer making SIR-tests for PWBs.
>
> It will be interesting to see what you others apply.....
>
> Ingemar Hernefjord
> Ericsson Microwave Systems
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Francis Sun
> Sent: den 10 augusti 2006 18:11
> To: [log in to unmask]
> Subject: [TN] Ionic/Chloride contamination levels
>
> Hi Forum,
>
> Can anyone tell me what is the general industry acceptance level for
> chloride contamination on a assembled board for a class 2 product
> please.
> I am getting conflicting statements from 2 evaluation labs.
> One says 6.5ug/in2 is acceptable in the industry.
> Another says 3ug/in2 is the industry standard or will/should be the
> industry standard.
>
> Is there an IPC committee looking at update the acceptable levels?
> Thanks in advance for all inputs, opinions and facts
>
> Regards;
>
> Francis Sun
> MARK IV Industries
> (905) 624-3025 ext. 1235
> Fax: (905) 624-4572
>
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