Rob
Yes I do.
Unfortunately since the NPL is now a "Commercial Enterprise" with Government
support, in other words they sell unpublished info. which is what this is.
However, the copies run only around $35 each. Contact:
[log in to unmask]
I will happily send you some extracts and other support data if you can give
me your SnailMail address please.
As to your question about flux density, we have evidenced a lowered SIR
dependant upon the amount of flux residue present. However, as I am not
clear about your question, could you please elaborate?
Regards,
Graham Naisbitt
[log in to unmask]
Concoat Ltd
Alasan House, Albany Park
CAMBERLEY GU15 2PL UK
Tel: +44 (0) 1276 691100 Fax: +44 (0) 1276 691227
----- Original Message -----
From: Rob Watson <[log in to unmask]>
To: TechNet E-Mail Forum. <[log in to unmask]>; Graham Naisbitt
<[log in to unmask]>
Sent: Monday, June 21, 1999 5:08 PM
Subject: Re: [TN] Spray fluxing...........How do you do it right
> Graham,
> Do you have access to the study results from NPL? I would like to see
that
> study. I would like to know what the effects are of too much/little flux
> applied. Also, do you know how flux density plays a part in solder joint
> reliability?
>
> Thanks in advance,
> Rob Watson
> Sanmina Corp. Plant 10
> Durham, NC
>
>
> Graham Naisbitt wrote:
>
> > Neil,
> >
> > I presume from your posting that you are not cleaning after soldering.
> >
> > I would strongly recommend that you try and keep the amount of flux
applied
> > under some control. As all fluxes leave residues, the way in which these
> > react can lead to unpredictable or at least undesirable reliability
issues.
> >
> > The NPL in the UK have completed a study which shows the amount of flux
> > used, grossly affects reliability.
> >
> > Of course if the product is of low consequence then this may not be
> > relevant. However, if you are producing something that is HiRel or
Safety
> > Critical, then maybe it is relevant.
> >
> > Might be a good idea to then validate your production process to yield
the
> > best results and then keep it under control. Try IPC-J-STD-001 Appendix
> > D.Regards,
> > Graham Naisbitt [log in to unmask] Concoat Ltd
> > Alasan House, Albany Park
> > CAMBERLEY GU15 2PL UK Tel: +44 (0) 1276 691100 Fax: +44 (0) 1276 691227
>
>
>
>
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