Hi everyone, this is my first time on this forum, so please be gentle with
me.
I'm very interested in all the discussion on CASTIN (and the free
advertising of it).
I am currently looking for a no-clean solder with a 25 year reliability
issue for a military use. Although the move to lead free is not being
imposed on military contracts as yet.........I feel it is only a matter of
time...........SO:-
* Is Castin a no-clean product?
* What is the flux medium used?
* What is the accepted reliability time span for the product?
* What are the equipment cleaning implications?
* What are the waste disposal criteria?
* What are the cost implications in comparison with lead solder
products?
* What is the availability in the UK?
* Can it be x-rayed for inspection purposes.....i.e. is it visible on
x-ray, as x-ray sees the lead in the solder.
* Is there a physical difference in the resulting joint, more or less
voids for example?
* What is the metal content of Castin?
* Is it available in all the same formats as lead solder, cored wire,
paste etc?
* Are there any additional SIR issues?
* Where can I get more information, UK based?
Best Regards
Bridget V. Piper
Producibility Engineer
BAeL&SS
Tel:- 0181 553 8166
Fax:- 0181 553 8465
> -----Original Message-----
> From: David Suraski - AIM [SMTP:[log in to unmask]]
> Sent: 01 July 1999 22:17
> To: [log in to unmask]
> Subject: [LF]
>
> Hi Everyone,
>
> It's great to see the continued widespread interest in CASTIN. We have
> done a great deal of research into the alloy, and we have concluded that
> CASTIN is a viable lead-free alternative to lead-bearing solders. Dave
> Hillman does bring up some very valid questions- let me try to answer them
> in order:
>
> a) It is true that the reflow temp while using CASTIN would be
> 235-240C, compared to 220C with Sn63/Pb37. However, we have found that
> most components can withstand this extra heat w/no degradation to their
> reliability. Problems sometimes seem to arise while using pastes that
> require a peak temp of 260C or greater, as with some Sn/Cu alloys.
>
> b) Today's reflow equipment can withstand this minor increase in
> temperature without resulting in additional maintenance. Again,
> temperatures in the high 200'sC could affect the equipment.
>
> c) The same flux vehicle systems available for Sn/Pb alloys can be used
> with CASTIN.
>
> d) CASTIN has been tested with up to 0.5% lead contamination, and joint
> integrity was not harmed by the interaction. Basically, tests have proven
> that CASTIN is compatible with small amounts of lead introduced from
> leads, HASL, etc.
>
> e) The CASTIN alloy is fully recyclable- there are no restrictions on
> this, although it is preferable to keep it separate from Sn/Pb solders to
> be recycled.
>
> f) CASTIN is available as a repair product. Again, if there is an
> accidental introduction of lead into CASTIN, CASTIN can withstand this
> interaction without suffering joint degradation.
>
> I fully agree with Dave that a "mad dash toward lead free solder alloys
> without good planning and data is a problem waiting to happen". That is
> why AIM has spent considerable time and resources to develop and test the
> CASTIN alloy. AIM feels confident that CASTIN is a viable lead-free
> solder, as do the several other solder manufacturers who have been
> licensed to sell CASTIN on a global basis.
>
> Please feel free to contact me with any questions or to receive additional
> information about CASTIN.
>
> Thank you and best regards,
>
> David Suraski
> Technical Marketing Specialist
> AIM
> __________________________________________________________________________
> _______________________
>
> Hi Ryan! I don't mean to sound overly negative but the words "drop in
> replacement" have an enormous meaning! Here are just a few issues that
> need
> addressed:
>
> a) If the solder alloy reflows at 215-217C and I add enough extra heat
> for
> assembly thermal mass needs I now have a reflow temperature near 240C (or
> higher!). How will this impact component reliability?
>
> b) What is the impact on my reflow equipment in terms of maintenance for
> these higher temperatures?
>
> c) What is the flux used for these higher temperatures and it's
> relationship to assembly cleanliness?
>
> d) If the assembly components have a lead containing lead finish - what
> will be the resulting solder joint metallurgy look like and what is its
> thermal cycle reliability for a number of use environments?
>
> e) What is the recycling plan for any solder process waste associated with
> this alloy?
>
> f) Will this assembly be repaired and have repair procedures been
> established? How can the repair facility tell if an assembly contains this
> alloy?
>
> The overall movement of the electronics industry toward a lead free
> solder/soldering systems is good but there are a number of technical
> issues
> that need to be characterized, investigated, understood, and implemented
> prior to "forging" ahead. A mad dash toward lead free solder alloys
> without
> good planning and data is a problem waiting to happen.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask] <mailto:[log in to unmask]>
> "the opinions expressed are mine and not necessarily reflective of the
> Rockwell Collins Inc."
>
> Ryan Jennens < [log in to unmask] <mailto:[log in to unmask]>> on 06/29/99
> 02:42:09 PM
>
> Please respond to "TechNet E-Mail Forum." < [log in to unmask]
> <mailto:[log in to unmask]>>; Please respond
> to Ryan Jennens < [log in to unmask] <mailto:[log in to unmask]>>
>
> To: [log in to unmask] <mailto:[log in to unmask]>
> cc:
> Subject: [TN] FW: Castin
>
> -----Original Message-----
> From: Ryan Jennens [ <mailto:[log in to unmask]>]
> Sent: Tuesday, June 29, 1999 12:10 PM
> To: TechNet
> Subject: Castin
>
> Mornin' all-
>
> With all this talk about lead-free, I found that Aim solder has a
> patented alloy which they say is a drop is replacement for lead solder. I
> have ordered a sample and am interested not because it is lead free, but
> because it has a nearly eutectic melting point of 215-217C. Does any body
> have any experience with this solder paste? Is there anything I should be
> aware of before I use it? Are there similar products which have nearly
> eutectic melting points? I examined the tech sheets for it and their
> claims
> seem to be accurate. I have included the link so the technetters can see
> if
> there is anything I failed to notice in the tech sheets.
>
> <http://www.aimsolder.com/castinp.htm>
>
> -Ryan Jennens
> TelGen Corporation
>
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