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Doug
If that is the piece of string you were keeping to hang someone with, its
too short!
Irving,
Most of our customers presently employ a go/no-go at something less than
0.2microgrammes of NaCl equivalence per cm2. The old 1.5 limit may be too
high for many modern circuit designs. Remember, that old spec should be
interpreted as: It is acceptable to leave UP TO 1.5mg/cm2 on your assembly
surface, and that cant be a good thing.
--
Regards Graham Naisbitt
[log in to unmask]
Concoat Limited - Engineering Reliability in Electronics
A British Manufacturer
www.conformalcoating.com www.concoat.co.uk www.concoatsystems.com
Golf Quote of the week: I may be the only golfer never to have broken a
single putter...if you donšt count the one I twisted into a loop and threw
into a bush.
Cell: 079 6858 2121
Office: +44 (0)1252 813706
> Irving,
> In October and November 2000, I wrote two articles for IPC Review on
> cleanliness requirements in IPC and military standards. The October
> article was aimed at bare boards, the November article on assemblies. They
> are available from the IPC, along with other articles I have written on the
> subject. Jack Crawford tells me you can find those papers here:
>
> http://files.ipc.org/cleaning_papers.zip
>
> As for determining how clean YOUR assemblies need to be for YOUR
> application and end use environment, that is still up to you to determine.
> Both Brian Ellis and I have written on the topic (ad nauseum) and a search
> through the IPC archive would be beneficial to you.
>
> As for the length of a string, I keep tellin' ya, it's 8.4 cm. I have it
> sitting right here in front of me.
>
> Doug Pauls
> Rockwell Collins.
>
>
>
>
> Irving Lee
> <Lee.Irving@INVEN To: [log in to unmask]
> TEC.COM> cc:
> Sent by: TechNet Subject: [TN] Ionic
> contamination of PCA
> <[log in to unmask]>
>
>
> 08/31/2004 01:11
> AM
> Please respond to
> TechNet E-Mail
> Forum; Please
> respond to
> Lee.Irving
>
>
>
>
>
>
>
> Does someone have any idea for the ionic contamination criteria on PCBA ?
>
>
> Best regards
>
> Irving Lee
>
> QA,EBG Inventec
>
> +886-3-3900000 ext 2164
> +886-9100-79999
> [log in to unmask]
>
>
>
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the BODY (NOT the subject field): SIGNOFF Technet
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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
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