The medium carrying the solids changes viscosity as it ages and evaporates and oxidises and/or reduces); the solder balls settle as gravity exerts its ever-present force; the flux reacts with the vehicle and solder reducing the fluxing potency and the vehicle viscosity and solder wettability. There are probably other effects, but those are the big ones that I've read about.
Donald.
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On 2019-11-05 6:30 p.m., Charlie Hansen wrote:
"> Be aware that the rated shelf life is anywhere from 6 months to a
year. It lasts longer if you keep it refrigerated, especially after
breaking the seal."
Guys, there's something I always wanted to know about that shelf
life....what the heck causes the stuff to go bad?
Charlie
On Tue, 05 Nov 2019 14:51:58 -0700 "Dwayne Reid" <dwayner@...>
writes:
Hi there.
We have been purchasing 63/37 solder paste from Chip Quik - both
direct and via Digikey. It's available in both syringe and jar
form.
Be aware that the rated shelf life is anywhere from 6 months to a
year. It lasts longer if you keep it refrigerated, especially after
breaking the seal.
We normally purchase the Water Soluble flux version - we then just
wash the boards under running hot water and blow dry with compressed
air. This works especially well for the small prototype board runs
that we do.
dwayne
At 10:39 AM 11/5/2019, Dave wrote:
I have plenty of regular solder, and plenty of flux, now I need to
buy some solder paste for smd stuff. Any recommendations? I would
like some in a jar and also a syringe just to have both. Is
no-clean
solder better? Also, I just want tin/lead solder if it is still
available.
Thanks,
Dave
