Arre these whiskers?

[Jan Panteltje]

Does anybody here know what this is:
http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

It is the inside of my Mastech clamp on meter,
use it every now and then to measure high DC current mainly.

Yesterday it stopped working (well most of the tries).
Apart from the worst soldering I have seen in years,
look between the chip pins, something is spreading out there.

Are these whiskers?
I tried scratching with a screwdriver between pin 3 and 4 and 4 and five from the top,
it is possible to remove that grey stuff.

I was stored dry at room temperature with every other test equipment and
those still work OK...

Best way to remove?

Remove chip and solder back with 60/40?

 

[Jan Panteltje]

On a sunny day (Fri, 11 Oct 2019 11:10:48 +0200) it happened Jeroen Belleman
<jeroen@nospam.please> wrote in <qnpguo$l8n$1@gioia.aioe.org>:

Jan Panteltje wrote:
Does anybody here know what this is:
http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

Jeroen Belleman

OK, thanks, looks like I have to take the whole thing apart then to find the fault.

 

[Jeroen Belleman]

Jan Panteltje wrote:

Does anybody here know what this is:
http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

Jeroen Belleman

 

[Martin Brown]

On 11/10/2019 10:10, Jeroen Belleman wrote:

Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can sometimes
end up being slightly hygroscopic and therefore leak current pin to pin.

--
Regards,
Martin Brown

 

Jeroen Belleman <jeroen@nospam.please> wrote in news:qnpguo$l8n$1
@gioia.aioe.org:

Jan Panteltje wrote:
Does anybody here know what this is:
http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

Jeroen Belleman

Seems so.

Yes, looks VOC rich too. Incomplete cleaning followed possibly by
some other solvent that also didn't. There can be conduction/leakage
paths.

 

[John S]

On 10/11/2019 5:18 AM, Martin Brown wrote:

On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can sometimes
end up being slightly hygroscopic and therefore leak current pin to pin.

+2. Clean thoroughly with acetone and brush. Rinse with IPA and brush.

 

John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.

NOT acetone! That melts many polymers and the silk screen inks and
softens the solder mask layer as well.

Simply use a brominated solvent.

 

[John Robertson]

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org wrote:

John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


NOT acetone! That melts many polymers and the silk screen inks and
softens the solder mask layer as well.

Simply use a brominated solvent.

Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

 

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in
news:6bbcf4b4-52c7-4979-834a-01fb380c3485@googlegroups.com:

fredag den 11. oktober 2019 kl. 17.32.10 UTC+2 skrev
DecadentLinux...@decadence.org:
John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m.,
DecadentLinuxUserNumeroUno@decadence.org wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux
can sometimes end up being slightly hygroscopic and
therefore leak current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA
and brush.


NOT acetone! That melts many polymers and the silk screen
inks and
softens the solder mask layer as well.

Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#



I didn't say halogenated, dipshit. I said BROMINATED.


"Halogenated solvent is an organic solvent, molecules of which
contain halogenic atoms: chlorine (Cl), fluorine (F) , bromine
(Br) or iodine (I)."

The one I cited is one of the cleanest, safest around.

You think acetone is inert?

 

[Lasse Langwadt Christense]

fredag den 11. oktober 2019 kl. 17.32.10 UTC+2 skrev DecadentLinux...@decadence.org:

John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org
wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


NOT acetone! That melts many polymers and the silk screen
inks and
softens the solder mask layer as well.

Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#



I didn't say halogenated, dipshit. I said BROMINATED.

"Halogenated solvent is an organic solvent, molecules of which contain halogenic atoms: chlorine (Cl), fluorine (F) , bromine (Br) or iodine (I)."

 

John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org
wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


NOT acetone! That melts many polymers and the silk screen
inks and
softens the solder mask layer as well.

Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

I didn't say halogenated, dipshit. I said BROMINATED.

<https://www.envirotechint.com/blog/ensolv-the-time-tested-cleaner/>
It is what Boeing uses. And no, my idea of Boeing and their
quality level did not take a hit over two pilot (training) error
centered plane crashes.

 

On Fri, 11 Oct 2019 08:54:54 GMT, Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote:

Does anybody here know what this is:
http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

It is the inside of my Mastech clamp on meter,
use it every now and then to measure high DC current mainly.

Yesterday it stopped working (well most of the tries).
Apart from the worst soldering I have seen in years,
look between the chip pins, something is spreading out there.

Are these whiskers?
I tried scratching with a screwdriver between pin 3 and 4 and 4 and five from the top,
it is possible to remove that grey stuff.

I was stored dry at room temperature with every other test equipment and
those still work OK...

Best way to remove?

Remove chip and solder back with 60/40?

Looks like white residue from flux, and it was probably manufactured
that way. If the chip is digital or normal analog, it won't matter. If
you don't like it, use flux remover or soapy water and and brush hard.

I like Soft Scrub for cleaning electronics, especially copperclad.

That is one really mis-registered drill!

This is whiskers growing out of tin plate:

https://www.dropbox.com/s/2qm8evos8iolmsr/2016-07-19_11-43-04-AM.jpg?raw=1



--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Martin Brown]

On 11/10/2019 16:32, DecadentLinuxUserNumeroUno@decadence.org wrote:

John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org
wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


NOT acetone! That melts many polymers and the silk screen
inks and
softens the solder mask layer as well.

Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

I didn't say halogenated, dipshit. I said BROMINATED.

https://www.envirotechint.com/blog/ensolv-the-time-tested-cleaner/
It is what Boeing uses. And no, my idea of Boeing and their
quality level did not take a hit over two pilot (training) error
centered plane crashes.

Bromine *is* a halogen you half wit. N bromopropane is not as benign or
inert as you seem to think. Quite a few exposure accidents.

https://www.osha.gov/dts/hazardalerts/1bromopropane_hazard_alert.html

When the nearly inert CFC degreasers got banned by the Montreal protocol
we had all sorts of fun trying to find an adequate degreaser for hard
vacuum electronics that worked well enough without being too toxic.

--
Regards,
Martin Brown

 

[Don Kuenz]

John Robertson <spam@flippers.com> wrote:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
?http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


NOT acetone! That melts many polymers and the silk screen inks and
softens the solder mask layer as well.

Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

Halogenated solvent is an organic solvent, molecules of which
contain halogenic atoms: chlorine (Cl), fluorine (F) , bromine
(Br) or iodine (I).

Good information from the website at your link.

Thank you, 73,

--
Don Kuenz KB7RPU
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.

 

[Lasse Langwadt Christense]

fredag den 11. oktober 2019 kl. 22.21.35 UTC+2 skrev Phil Hobbs:

On 2019-10-11 12:31, Martin Brown wrote:
On 11/10/2019 16:32, DecadentLinuxUserNumeroUno@decadence.org wrote:
John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org
wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
   http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


    NOT acetone!  That melts many polymers and the silk screen
    inks and
softens the solder mask layer as well.

    Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

   I didn't say halogenated, dipshit.  I said BROMINATED.

https://www.envirotechint.com/blog/ensolv-the-time-tested-cleaner/
   It is what Boeing uses.  And no, my idea of Boeing and their
quality level did not take a hit over two pilot (training) error
centered plane crashes.


Bromine *is* a halogen you half wit. N bromopropane is not as benign or
inert as you seem to think. Quite a few exposure accidents.

https://www.osha.gov/dts/hazardalerts/1bromopropane_hazard_alert.html

When the nearly inert CFC degreasers got banned by the Montreal protocol
we had all sorts of fun trying to find an adequate degreaser for hard
vacuum electronics that worked well enough without being too toxic.


CO2 snow is about the best around--it melts on impact, and liquid CO2 is
a wonderful organic solvent.

afaik solid CO2 doesn't turn liquid, it turns directly to gas

 

[Phil Hobbs]

On 2019-10-11 12:31, Martin Brown wrote:

On 11/10/2019 16:32, DecadentLinuxUserNumeroUno@decadence.org wrote:
John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org
wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
   http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


    NOT acetone!  That melts many polymers and the silk screen
    inks and
softens the solder mask layer as well.

    Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

   I didn't say halogenated, dipshit.  I said BROMINATED.

https://www.envirotechint.com/blog/ensolv-the-time-tested-cleaner/
   It is what Boeing uses.  And no, my idea of Boeing and their
quality level did not take a hit over two pilot (training) error
centered plane crashes.


Bromine *is* a halogen you half wit. N bromopropane is not as benign or
inert as you seem to think. Quite a few exposure accidents.

https://www.osha.gov/dts/hazardalerts/1bromopropane_hazard_alert.html

When the nearly inert CFC degreasers got banned by the Montreal protocol
we had all sorts of fun trying to find an adequate degreaser for hard
vacuum electronics that worked well enough without being too toxic.

CO2 snow is about the best around--it melts on impact, and liquid CO2 is
a wonderful organic solvent.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Phil Hobbs]

On 2019-10-11 16:31, Lasse Langwadt Christensen wrote:

fredag den 11. oktober 2019 kl. 22.21.35 UTC+2 skrev Phil Hobbs:
On 2019-10-11 12:31, Martin Brown wrote:
On 11/10/2019 16:32, DecadentLinuxUserNumeroUno@decadence.org wrote:
John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org
wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
   http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


    NOT acetone!  That melts many polymers and the silk screen
    inks and
softens the solder mask layer as well.

    Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

   I didn't say halogenated, dipshit.  I said BROMINATED.

https://www.envirotechint.com/blog/ensolv-the-time-tested-cleaner/
   It is what Boeing uses.  And no, my idea of Boeing and their
quality level did not take a hit over two pilot (training) error
centered plane crashes.


Bromine *is* a halogen you half wit. N bromopropane is not as benign or
inert as you seem to think. Quite a few exposure accidents.

https://www.osha.gov/dts/hazardalerts/1bromopropane_hazard_alert.html

When the nearly inert CFC degreasers got banned by the Montreal protocol
we had all sorts of fun trying to find an adequate degreaser for hard
vacuum electronics that worked well enough without being too toxic.


CO2 snow is about the best around--it melts on impact, and liquid CO2 is
a wonderful organic solvent.

afaik solid CO2 doesn't turn liquid, it turns directly to gas

It liquefies transiently on impact, which is why it works. Of course
it'll probably rip the silk screen off the board, but you can't have
everything.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Lasse Langwadt Christense]

lørdag den 12. oktober 2019 kl. 04.15.48 UTC+2 skrev DecadentLinux...@decadence.org:

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote in
news:qnqo8b$o43$4@dont-email.me:

Bromine *is* a halogen you half wit.

Learn to read threads, asshole. I already got that (proper)
corrective response and it was a damn sight more diplomatic than the
shit you post when you act that way.

You are better when you post intelligent material.

The above is not an example of that.

you set the tone: "I didn't say halogenated, dipshit. I said BROMINATED."

 

On Fri, 11 Oct 2019 17:31:50 +0100, Martin Brown
<'''newspam'''@nezumi.demon.co.uk> wrote:

On 11/10/2019 16:32, DecadentLinuxUserNumeroUno@decadence.org wrote:
John Robertson <spam@flippers.com> wrote in
news:dJSdnVEU0ORtEz3AnZ2dnUU7-LHNnZ2d@giganews.com:

On 2019/10/11 5:36 a.m., DecadentLinuxUserNumeroUno@decadence.org
wrote:
John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


NOT acetone! That melts many polymers and the silk screen
inks and
softens the solder mask layer as well.

Simply use a brominated solvent.


Simply?

http://substech.com/dokuwiki/doku.php?id=halogenated_solvents

Not god for your lungs or liver!

I'd prefer to use 99% alcohol from the pharmacist/chemist...

John :-#(#

I didn't say halogenated, dipshit. I said BROMINATED.

https://www.envirotechint.com/blog/ensolv-the-time-tested-cleaner/
It is what Boeing uses. And no, my idea of Boeing and their
quality level did not take a hit over two pilot (training) error
centered plane crashes.


Bromine *is* a halogen you half wit. N bromopropane is not as benign or
inert as you seem to think. Quite a few exposure accidents.

https://www.osha.gov/dts/hazardalerts/1bromopropane_hazard_alert.html

When the nearly inert CFC degreasers got banned by the Montreal protocol
we had all sorts of fun trying to find an adequate degreaser for hard
vacuum electronics that worked well enough without being too toxic.

I used to play with nitrobenzene when I was a kid, Kerr cells mostly.
Just lately I found out that skin exposure can be lethal. Learned that
from a Nero Wolfe mystery.

Chemical supply houses used to sell most anything to anybody, even
kids.



--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

On Fri, 11 Oct 2019 12:36:46 +0000 (UTC),
DecadentLinuxUserNumeroUno@decadence.org wrote:

John S <Sophi.2@invalid.org> wrote in
news:qnpsrb$mec$1@dont-email.me:

On 10/11/2019 5:18 AM, Martin Brown wrote:
On 11/10/2019 10:10, Jeroen Belleman wrote:
Jan Panteltje wrote:
Does anybody here know what this is:
 http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

That looks more like flux residue. Today's water-based
flux often leaves residues like that.

+1

Might still be worth cleaning it off though. Degraded flux can
sometimes end up being slightly hygroscopic and therefore leak
current pin to pin.


+2. Clean thoroughly with acetone and brush. Rinse with IPA and
brush.


NOT acetone! That melts many polymers and the silk screen inks and
softens the solder mask layer as well.

Simply use a brominated solvent.

I use acetone to clean off flux when I hand solder things on PC
boards. Works great with a q-tip. I've never seen it affect the
silkscreen or solder mask.




--

John Larkin Highland Technology, Inc

lunatic fringe electronics