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

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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 don¹t count the one I twisted into a loop and threw
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> 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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