January 6, 2008

If the solder flux used is RMA or equivalent, is there any real benefit to 
doing a cleanliness test?  I have reviewed OEM cleanliness test resords at 
several OEMs and the data I reviewed shows folks rarely, if ever fail this 
test.


>From: Graham Collins <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
>To: [log in to unmask]
>Subject: Re: [TN] specifying board cleanliness
>Date: Thu, 3 Jan 2008 11:09:58 -0400
>
>Happy New Year Phil!
>Well, "it depends"...
>
>First question is how clean do you need them to be?  Depends on the
>application and environment.  Second question is what sort of assembly
>process the CM is using - if "no clean" then they will be justifiably
>opposed to cleanliness testing.
>
>The generic callout that we most commonly see on drawings is "clean per
>J-STD-001 C-22" - which translates into clean the assembly, both sides,
>and then do an ionic contamination test with a upper limit of 1.56
>micrograms / cm2 NaCl equivalent contamination.  I'm not sure why
>J-STD-001 gives an option to only clean one side - never seen that
>process in use.  Anyway, a starting point...
>
>regards,
>
>Graham Collins
>Halifax Production Engineering
>L-3 communications Electronic Systems
>(902) 873-2000 ext. 6215
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
>Sent: Thursday, January 03, 2008 10:45 AM
>To: [log in to unmask]
>Subject: [TN] specifying board cleanliness
>
>Good Morning and Happy New Year to All,
>
>Let me start by confessing my ignorance relative to cleanliness of
>circuit boards.  We have no idea what numbers to specify that fit into
>the IPC testing methods for board cleanliness.  If I tell my CMs to make
>the boards clean, it would be good to specify a target value and or test
>method.
>
>Can someone give me some guidance on how to chose these specifications?
>What are worth while tests and which ones are window dressing?
>
>I've read through some of the IPC tests methods and my head hurts.
>
>Thanks in advance,
>
>Phil Nutting
>
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