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:
? Ă?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.
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
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:
? Ă?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.
Some methanol was acquired by me after you mentioned it in a different,
much older thread. Do you suppose methanol is a good candidate to solve
Jan's problem? (Although Sylvia's solution seems best at this point.)
Methanol's MSDS concerns me. It makes me reluctant to even open it.
https://www.labchem.com/tools/msds/msds/VT430.pdf
Thank you, 73,