Not always possible, Reuven.
The issue is that most solder paste distributors will not accept orders for small quantities of solder paste. There is usually a minimum buy of about 20 of the 500-600 CC cartridges or jars. Therefore many smaller companies have to find distributors who will sell them smaller quantities, or they need to re-certify their paste for a longer shelf life.
However, I recently found out that some distributors may provide paste in smaller quantites if it is purchased in smaller 50 or 100 cc syringes, which might work for some folks.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven Rokah
Sent: Monday, January 16, 2012 1:24 PM
To: [log in to unmask]
Subject: Re: [TN] Expired Solder Paste
You should plan your solder paste consumption / purchasing according the
shelf life of the SP and store it according the manufacturer instruction
and manage it in FIFO priority.
If you are talking on years after expiration date, you have a big logistic
and process problems.
Reuven
On Mon, Jan 16, 2012 at 8:37 PM, Matthias Mansfeld <
[log in to unmask]> wrote:
> On 16 Jan 2012 at 8:17, Stadem, Richard D. wrote:
>
> > You can re-certify expired solder paste per J-STD-005 section 6.0.
> > Used the form attached therein, and follow the appropriate test
> > methods (also listed at the end of J-STD-005, #2.4.34, 2.4.34.1,
> > 2.4.34.2, 2.4.34.3 for the viscometer you wish to use. You should
> > always perform first article testing, monitor your PPMO, etc., and
> > document all product run with the re-certified paste.
>
> For what it's worth, a good solder paste, stored under good
> conditions may work well even years after expiration. Been there,
> done that without re-certification (don't worry, no customer
> projects, just some own DIY-stuff....). For this stuff I use still
> the same 1kg-jar with old Sn63Pb Alpha RMA390D3K from 2003.... prints
> well, tacky like new, and visually perfect, shiny solder joints...
> even 8 years after expiration date.
>
> Best regards
> Matthias Mansfeld
> --
> Matthias Mansfeld Elektronik * Leiterplattenlayout
> Neithardtstr. 3, 85540 Haar; Tel.: 089/4620 093-7, Fax: -8
> Internet: http://www.mansfeld-elektronik.de
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