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
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