Doug,
1. I am mainly concerned about the cleanliness of assemblies which are
coming at exit of cleaning and drying station.Is there IPC standard
procedure , instrument , titration or test method which can be used to
monitor cleanliness of assemblies.Please advise.
I understand from you reply that IPC is developing method but how others
PCB assembly houses are monitoring now.

Is there anybody using titration for process monitoring??

2.Can you suggest any cost-effective methods which can be installed on
station for sample basis or online monitoring??What to do when the
resistivity or rinse water is out of range ??

> ----------
> From:         Doug Pauls[SMTP:[log in to unmask]]
> Sent:         November 6, 1997 11:29 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Cleanliness of boards
>
> In a message dated 97-11-06 09:56:28 EST, you write:
>
> > We are using water soluble flux and solder pastes. How we can check
> >  cleaning quality at exit of water cleaning and drying station?
>
> Are you talking about monitoring the cleanliness of the water going
> into your
> aqueous cleaner or checking the ionic cleanliness of the assemblies
> after
> aqueous cleaning?
>
> For the former, an in-line resistivity monitor should do.  For the
> latter, I
> suggest ion chromatography (IPC method 2.3.28) as an analytical tool,
> and
> then use the modified ROSE method, developed by Phil Wittmer at Delco.
> That
> method is currently in draft form for IPC review as 2.3.25.1.  This
> method
> uses the ion chromatography extraction method, but allows you to use
> your
> ionic cleanliness tester.  Phil has found reasonably good correlation
> between
> IC and the mod-ROSE method.  The background paper was published in the
> IPC
> Technical Review, March of 97.
>
> >  What methods are being used by process engineers for
> checking/monitoring
> >  cleaning quality?
>
> In my experience, the most used (but least understood) measurement
> tool is
> bulk ionic cleanliess (ROSE).  Only a small fraction of engineers have
> baselined the response of the instrument against another analytical
> residue
> detection method.  I really think the mod-ROSE method shows real
> promise as a
> process control tool.
>
> Doug Pauls
> CSL
>
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