Arre these whiskers?

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.

 

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in
news:622e7d09-50f4-4a7b-bae3-438f0a770093@googlegroups.com:

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."

Yes, fucktard, and I was corrected just after, and dumbfucks like
him and apparently you fail to see that I noted his correction.

Tone? Fuck off.

 

[Rick C]

On Friday, October 11, 2019 at 9:58:36 PM UTC-4, jla...@highlandsniptechnology.com wrote:

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.

Likewise hydrofluoric acid can be fatal. Spill some on your skin and use all the remedies you want to deal with the acid burn, you may die because it is readily absorbed through the skin and reacts with calcium in the blood to cause cardiac arrest.

In my first job as a chemist one of the other inmates decided to etch beakers with his name. He didn't get hurt, but I doubt he really appreciated the hazard.

--

Rick C.

- Get 2,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209

 

[Sylvia Else]

On 11/10/2019 7:54 pm, Jan Panteltje 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?

Tin pest?

Does the grey stuff melt if you heat it?

Sylvia.

 

[Rick C]

On Friday, October 11, 2019 at 11:22:00 PM UTC-4, Lasse Langwadt Christensen wrote:

lørdag den 12. oktober 2019 kl. 05.03.50 UTC+2 skrev Rick C:
On Friday, October 11, 2019 at 9:58:36 PM UTC-4, jla...@highlandsniptechnology.com wrote:
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.

Likewise hydrofluoric acid can be fatal. Spill some on your skin and use all the remedies you want to deal with the acid burn, you may die because it is readily absorbed through the skin and reacts with calcium in the blood to cause cardiac arrest.


there are some stupidly dangerous chemicals

https://en.wikipedia.org/wiki/Karen_Wetterhahn

she got a few drops of dimethylmercury on her latex glove, a few months later she was in a coma 12 months later dead

this guys has an interesting list:

https://blogs.sciencemag.org/pipeline/archives/category/things-i-wont-work-with

This makes me recall a story a professor told us about another professor at a different university who had a grad student working on a new compound. After a few weeks he got sick, entered the hospital and after some time died without the doctors knowing what killed him. The professor set up another grad student to work in a hood and wear protective clothing just in case the compound had anything to do with the first grad student's death. After a few weeks that student became ill, entered the hospital and died, again, without the doctors figuring out what was wrong. We were told that professor had another grad student work with the same compound in a laminar flow hood with the same result.

I think I remember the story because I had never heard of a laminar flow hood and my professor told us what that was. It is designed to not have any backwash of the air entering the hood. But nothing is perfect and whatever that compound was a very small exposure was still very dangerous.

I made the mistake of googling for this accident. I didn't find it because it would have been some 50 years ago, but in the articles I did find there seem to be a lot of accidents, fatal even, on college campuses.

--

Rick C.

+ Get 2,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

 

[Jan Panteltje]

On a sunny day (Sat, 12 Oct 2019 16:38:44 +1100) it happened Sylvia Else
<sylvia@email.invalid> wrote in <h0d774Fpd45U1@mid.individual.net>:

On 11/10/2019 7:54 pm, Jan Panteltje wrote:
Does anybody here know what this is:
http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

Tin pest?

Yes that is what I meant with 'whiskers'


>Does the grey stuff melt if you heat it?

Have not tried,
I took the thing apart and noticed the mechanical construction is horrible,
if you turn the rotary switch (mode select and on/off), then that
bends the PCB, as they omitted any mechanical support.
That plus the bad soldering causes dry joints (bad contacts).
On top of that they use a flex PCB to the clamp that is squeezed badly
http://panteltje.com/pub/mastech_clamp_meter_PCB_top_IXIMG_0188.JPG

The PCB under the rotary switch on the left (that presses onto it) is not supported.
Only 3 screws on the right.


Well, I got it cheap

Soldering job for a rainy day...

At a reasonably hourly rate buy a new one (of different make).

 

Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> wrote in
news:qnrqqh$n0r$1@dont-email.me:

On a sunny day (Sat, 12 Oct 2019 16:38:44 +1100) it happened
Sylvia Else <sylvia@email.invalid> wrote in
h0d774Fpd45U1@mid.individual.net>:

On 11/10/2019 7:54 pm, Jan Panteltje wrote:
Does anybody here know what this is:
http://panteltje.com/pub/whiskers_detail_IXIMG_0186.JPG
?

Tin pest?

Yes that is what I meant with 'whiskers'


Does the grey stuff melt if you heat it?

Have not tried,

That is the way to go. Heat up the entire PCB to about 60 C. That
is like 120F. Let that soak it up for a few minutes (about 5 to 7)

Also heat up your 91% alcohol. I use a microwave in 5 to 10 second
spurts. It boils pretty quickly. Do not be a smoker.

That will solve the stuff easier and wash away easier and evaporate
easier.

All three elements make for a cleaner board and your leakage
problem will disappear.

 

[Cursitor Doom]

On Fri, 11 Oct 2019 19:38:22 -0700, Lasse Langwadt Christensen wrote:

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

A colourful and unashamed public display of ignorance if ever there were
one.



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.

 

Cursitor Doom <curd@notformail.com> wrote in
news:qnsg74$q3a$4@dont-email.me:

On Fri, 11 Oct 2019 19:38:22 -0700, Lasse Langwadt Christensen
wrote:

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

A colourful and unashamed public display of ignorance if ever
there were one.

Yes, and if you were not such a dumbfuck, you would have noticed
where I acknowledged the correction. On the very next post even.

But no, you just want to spew what amounts to your ignorance.

 

[Cursitor Doom]

On Fri, 11 Oct 2019 20:21:56 -0700, Lasse Langwadt Christensen wrote:

she got a few drops of dimethylmercury on her latex glove, a few months
later she was in a coma 12 months later dead

It's an unfortunate fact that chemists tend to have a lower life
expectancy than other comparable professions.



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.

 

Cursitor Doom <curd@notformail.com> wrote in
news:qnsk1q$q3a$5@dont-email.me:

On Fri, 11 Oct 2019 20:21:56 -0700, Lasse Langwadt Christensen
wrote:

she got a few drops of dimethylmercury on her latex glove, a few
months later she was in a coma 12 months later dead

It's an unfortunate fact that chemists tend to have a lower life
expectancy than other comparable professions.

It is a famous case. It changed lab procedural policy around the
world.

And I think it was a single drop. And she did not merely go into a
coma. She acquired cancer. It was decidely the worst three months
of her life, and THEN came the pain and the coma and terminal
condition.

And she was far more than a mere "chemist".

 

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in news:d4250ac5-
dee2-4c1c-825c-f9afa98ba233@googlegroups.com:

did you not read the wiki?

I did not need to read the wiki. I was in San Diego and saw the case
break the news and followed it from the beginning.

YOU needed to read the wiki. I spoke from memory.

 

[Martin Brown]

On 12/10/2019 04:03, Rick C wrote:

On Friday, October 11, 2019 at 9:58:36 PM UTC-4,
jla...@highlandsniptechnology.com wrote:
On Fri, 11 Oct 2019 17:31:50 +0100, Martin Brown
'''newspam'''@nezumi.demon.co.uk> wrote:

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.

It is much tighter now. I my youth we made most of the fulminates as
well as silvering mirrors and I was into B-Z chemical clocks and dyes.
Most exotic thing I had made was 24DNPO (cyalume glostick patent) -
which funnily enough was recrystallised from nitrobenzene.

Likewise hydrofluoric acid can be fatal. Spill some on your skin and
use all the remedies you want to deal with the acid burn, you may die
because it is readily absorbed through the skin and reacts with
calcium in the blood to cause cardiac arrest.

I once drank green tea in a Japanese clean room surrounded by
semiconductor grade HF and HNO3 in stills. I couldn't really refuse it.

HF is one thing you should never handle without the antidote gel nearby.

https://en.wikipedia.org/wiki/Calcium_gluconate#Hydrofluoric_acid_burns

The HF safety film is one of a handful that often inflicts casualties on
its audience as big hefty welders keel over after seeing HF burns.

The other bad one is "wear eye protection" extracting a mild steel
splinter from an eyeball with a powerful electromagnetic pulse.

--
Regards,
Martin Brown

 

[Lasse Langwadt Christense]

lørdag den 12. oktober 2019 kl. 16.11.46 UTC+2 skrev DecadentLinux...@decadence.org:

Cursitor Doom <curd@notformail.com> wrote in
news:qnsk1q$q3a$5@dont-email.me:

On Fri, 11 Oct 2019 20:21:56 -0700, Lasse Langwadt Christensen
wrote:

she got a few drops of dimethylmercury on her latex glove, a few
months later she was in a coma 12 months later dead

It's an unfortunate fact that chemists tend to have a lower life
expectancy than other comparable professions.


It is a famous case. It changed lab procedural policy around the
world.

And I think it was a single drop. And she did not merely go into a
coma. She acquired cancer. It was decidely the worst three months
of her life, and THEN came the pain and the coma and terminal
condition.

did you not read the wiki?

"Approximately three months after the initial accident Wetterhahn began experiencing brief episodes of abdominal discomfort and noted significant weight loss. The more distinctive neurological symptoms of mercury poisoning, including loss of balance and slurred speech, appeared in January 1997, five months after the accident.[6] At this point, tests proved that she had a debilitating mercury intoxication.[2][3][5] Her urinary mercury content had risen to 234 Âľg per liter; its normal range is from 1 to 5 and the toxic level is > 50 Îźg/L.[6]

Despite aggressive chelation therapy, her condition rapidly deteriorated. Three weeks after the first neurological symptoms appeared, Wetterhahn lapsed into what appeared to be a vegetative state punctuated by periods of extreme agitation.[6] One of her former students said that "Her husband saw tears rolling down her face. I asked if she was in pain. The doctors said it didn't appear that her brain could even register pain."[5] Wetterhahn was removed from life support and died on June 8, 1997, less than a year after her initial exposure.[6] "

 

[John S]

On 10/12/2019 10:29 AM, DecadentLinuxUserNumeroUno@decadence.org wrote:

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in news:d4250ac5-
dee2-4c1c-825c-f9afa98ba233@googlegroups.com:

did you not read the wiki?


I did not need to read the wiki. I was in San Diego and saw the case
break the news and followed it from the beginning.

YOU needed to read the wiki. I spoke from memory.

YOU are a spherical asshole fit only for shitting into your mouth. A
human commode, so to speak.

 

John S <Sophi.2@invalid.org> wrote in
news:qntn27$fek$1@dont-email.me:

On 10/12/2019 10:29 AM, DecadentLinuxUserNumeroUno@decadence.org
wrote:
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote in
news:d4250ac5- dee2-4c1c-825c-f9afa98ba233@googlegroups.com:

did you not read the wiki?


I did not need to read the wiki. I was in San Diego and saw
the case
break the news and followed it from the beginning.

YOU needed to read the wiki. I spoke from memory.


YOU are a spherical asshole fit only for shitting into your mouth.
A human commode, so to speak.

Fuck you, retarded troll fuck.

 

On Sat, 12 Oct 2019 12:16:36 -0000 (UTC), Cursitor Doom
<curd@notformail.com> wrote:

On Fri, 11 Oct 2019 19:38:22 -0700, Lasse Langwadt Christensen wrote:

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

A colourful and unashamed public display of ignorance if ever there were
one.

You act like you're surprised.

 

[Steve Wilson]

Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

this guys has an interesting list:

https://blogs.sciencemag.org/pipeline/archives/category/things-i-wont-wor
k-with

---------------------------------------------------------------------------
Things I Won’t Work With: Selenophenol

15 May, 2012
This fine reagent was mentioned here (disparagingly) in the comments the
other day, and I knew that it was time to add it to the list. I’ve had some
other selenium entries before, and they’re all here for the same reason:
their unsupportable stenches.
---------------------------------------------------------------------------

Remember the old selenuim rectifiers from the '40s and '50s? And the stench
when they failed?

"Selenium rectifiers are allso semiconductor devices but amorphouse. In old
days we used to say taht each plate of rectifier can whithstand about 30V
of reverse voltage and that each square centimeter of it's surface can
whitstand 100mA of current. You should count number of plates connected in
series and calculate area of plate. One of the characteristics of selenium
rectifier is: they have about 30-50V voltage drop when they are designed
for 250V AC."

"And another peculiarity about selenium rectifiers is that they require the
evacuation of the room if accidentally (or deliberatly :twisted
shortened"

https://www.electro-tech-online.com/threads/old-time-selenium-rectifiers-
can-someone-explain-them.17786/

 

[Phil Hobbs]

On 2019-10-11 22:15, DecadentLinuxUserNumeroUno@decadence.org wrote:

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.

Your quoting is incorrect--I didn't write that.

Cheers

Phil Hobbs

 

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote in
news:qnuk24$qmr$3@dont-email.me:

On 2019-10-11 22:15, DecadentLinuxUserNumeroUno@decadence.org
wrote:
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.


Your quoting is incorrect--I didn't write that.

Cheers

Phil Hobbs

Sorry bout that, Phil.