|
Thanks Donald....
So, in a way it's like paint...solvent evaporates and the solids settle
out.
I just wonder what chemical the "medium" is....and if more of the same
were added and mixed would that prolong its life even more? Now, that's
with evaporation....oxidation is quite another issue. Any thoughts on
that?
Charlie
On Tue, 5 Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
toggle quoted message
Show quoted text
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.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ <>
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
|
I've tried thinning old dry paste with denatured alcohol and the result was that the components popped off the board like popcorn as soon as I heated it up.
ST
On Thu, Nov 7, 2019 at 3:35 AM Charlie Hansen < n0tt1@...> wrote: Thanks Donald....
So, in a way it's like paint...solvent evaporates and the solids settle
out.
I just wonder what chemical the "medium" is....and if more of the same
were added and mixed would that prolong its life even more?? Now, that's
with evaporation....oxidation is quite another issue.? Any thoughts on
that?
Charlie
On Tue, 5 Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
> 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.
> --
> *Plain Text* email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ <>
>
> 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
> >>
> >>
>
>
>
>
|
Had you tried thinning it with flux?
And you may have used too much, I can see the stuff boiling from
here.
Harvey
On 11/6/2019 11:15 PM, stefan_trethan
wrote:
toggle quoted message
Show quoted text
I've tried thinning old dry paste with denatured
alcohol and the result was that the components popped off the
board like popcorn as soon as I heated it up.
ST
On Thu, Nov 7, 2019 at 3:35 AM
Charlie Hansen < n0tt1@...> wrote:
Thanks
Donald....
So, in a way it's like paint...solvent evaporates and the
solids settle
out.
I just wonder what chemical the "medium" is....and if more of
the same
were added and mixed would that prolong its life even more??
Now, that's
with evaporation....oxidation is quite another issue.? Any
thoughts on
that?
Charlie
On Tue, 5 Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
> 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.
> --
> *Plain Text* email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ <>
>
> 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
> >>
> >>
>
>
>
>
|
No, all the liquid flux I had back then was in ethanol?or isopropanol solvent anyway. I'm sure there is a way, ideally just figure out what liquid they use in the first place, but after that experience I never bothered. I imagine it could be something like propylene glycol or glycerine.
With the chipquick stuff I don't really have a need any more.
ST
On Thu, Nov 7, 2019 at 5:42 AM Harvey White < madyn@...> wrote:
Had you tried thinning it with flux?
And you may have used too much, I can see the stuff boiling from
here.
Harvey
On 11/6/2019 11:15 PM, stefan_trethan
wrote:
I've tried thinning old dry paste with denatured
alcohol and the result was that the components popped off the
board like popcorn as soon as I heated it up.
ST
On Thu, Nov 7, 2019 at 3:35 AM
Charlie Hansen < n0tt1@...> wrote:
Thanks
Donald....
So, in a way it's like paint...solvent evaporates and the
solids settle
out.
I just wonder what chemical the "medium" is....and if more of
the same
were added and mixed would that prolong its life even more??
Now, that's
with evaporation....oxidation is quite another issue.? Any
thoughts on
that?
Charlie
On Tue, 5 Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
> 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.
> --
> *Plain Text* email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ <>
>
> 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
> >>
> >>
>
>
>
>
|
In addition to what Stefan said, I'd say it's probably not worth it. If the reliability of the joints is compromised by attempts to "rejuvenate" dead paste, how much is lost and how much is gained? I just buy the minimum amount I think I'll need. If there is leftover (there usually is) I take it to the municipal hazardous waste disposal site where they know how to handle lead-laden materials correctly. Donald. -- *Plain Text* email -- it's an accessibility issue () no proprietary attachments; no html mail /\ <> On 06-Nov-2019 18:30, Charlie Hansen wrote: Thanks Donald....
So, in a way it's like paint...solvent evaporates and the solids settle
out.
I just wonder what chemical the "medium" is....and if more of the same
were added and mixed would that prolong its life even more? Now, that's
with evaporation....oxidation is quite another issue. Any thoughts on
that?
Charlie
On Tue, 5 Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
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.
--
*Plain Text* email -- it's an accessibility issue
() no proprietary attachments; no html mail
/\ <>
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
[snip]
|
The MSDS for the ChipQuick solder past lists Terpineol.
? Mike N. ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of stefan_trethan
Sent: Wednesday, November 6, 2019 10:16 PM
To: [email protected]
Subject: Re: [homebrewpcbs] Solder paste recommendations ? I've tried thinning old dry paste with denatured alcohol and the result was that the components popped off the board like popcorn as soon as I heated it up. ? On Thu, Nov 7, 2019 at 3:35 AM Charlie Hansen <n0tt1@...> wrote: Thanks Donald....
So, in a way it's like paint...solvent evaporates and the solids settle
out.
I just wonder what chemical the "medium" is....and if more of the same
were added and mixed would that prolong its life even more?? Now, that's
with evaporation....oxidation is quite another issue.? Any thoughts on
that?
Charlie
On Tue, 5 Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
> 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.
> --
> *Plain Text* email -- it's an accessibility issue
> () no proprietary attachments; no html mail
> /\ <>
>
> 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
> >>
> >>
>
>
>
>
|
?
Thanks for the info Mike!
?
toggle quoted message
Show quoted text
The
MSDS for the ChipQuick solder past lists Terpineol.
?
Mike
N.
?
From:
[email protected] [mailto:[email protected]] On Behalf Of
stefan_trethan
Sent: Wednesday, November 6, 2019 10:16
PM
To: [email protected]
Subject: Re: [homebrewpcbs]
Solder paste recommendations
?
I've tried thinning old dry paste with denatured alcohol
and the result was that the components popped off the board like popcorn as
soon as I heated it up.
?
On Thu, Nov 7, 2019 at 3:35 AM Charlie Hansen <n0tt1@...>
wrote:
Thanks Donald....
So,
in a way it's like paint...solvent evaporates and the solids
settle
out.
I just wonder what chemical the "medium" is....and if
more of the same
were added and mixed would that prolong its life even
more?? Now, that's
with evaporation....oxidation is quite another
issue.? Any thoughts on
that?
Charlie
On Tue, 5
Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
> 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.
> --
> *Plain Text* email --
it's an accessibility issue
> () no proprietary attachments; no html
mail
> /\ <>
>
> 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
>
>>
> >>
>
>
>
>
?
|
?
OK...we can scratch alcohol off the list!? :D)
?
I've tried thinning old dry paste with denatured alcohol and the
result was that the components popped off the board like popcorn as soon as I
heated it up.
ST
On Thu, Nov 7, 2019 at 3:35 AM Charlie Hansen
< n0tt1@...> wrote: Thanks
Donald....
So, in a way it's like paint...solvent evaporates and the
solids settle
out.
I just wonder what chemical the "medium"
is....and if more of the same
were added and mixed would that prolong its
life even more?? Now, that's
with evaporation....oxidation is quite
another issue.? Any thoughts on
that?
Charlie
On
Tue, 5 Nov 2019 18:51:04 -0500 "Donald H Locker"
<dhlocker@...> writes:
> 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.
> --
> *Plain Text* email --
it's an accessibility issue
> () no proprietary attachments; no html
mail
> /\ <>
>
> 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
>
>>
> >>
>
>
>
>
?
|
