Soldering paste

A

AK

Guest
I recently received this and am learning about what applications it is good for.

https://imgur.com/3pGTm0a

I put a small amount on a project board and the solder seemed to adhere better.

I am using up some old RS solder that has the paste already in it, though it may have dried out quite a bit.

What situations would be good to use the paste in?

Thanks,
Andy
 
On Mon, 22 Jul 2019 20:21:17 -0700, AK wrote:

I am using up some old RS solder that has the paste already in it,
though it may have dried out quite a bit.
Click to expand...

Shouldn't have. I'm still using old lead solder from 20+ years ago no
problems.

> What situations would be good to use the paste in?

It has a very valuable role in certain circs; I'll leave that to someone
else to expand on.



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On Tuesday, July 23, 2019 at 12:07:24 PM UTC-5, Cursitor Doom wrote:
On Mon, 22 Jul 2019 20:21:17 -0700, AK wrote:

I am using up some old RS solder that has the paste already in it,
though it may have dried out quite a bit.

Shouldn't have. I'm still using old lead solder from 20+ years ago no
problems.

What situations would be good to use the paste in?

It has a very valuable role in certain circs; I'll leave that to someone
else to expand on.



--
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.
Click to expand...

I posted the question in the so called "advanced" group.

The responses looked as if they came from ex Barnum and Bailey clowns.

:)

Andy
 
On 24/07/2019 9:01 am, AK wrote:
On Tuesday, July 23, 2019 at 12:07:24 PM UTC-5, Cursitor Doom wrote:
On Mon, 22 Jul 2019 20:21:17 -0700, AK wrote:

I am using up some old RS solder that has the paste already in it,
though it may have dried out quite a bit.

Shouldn't have. I'm still using old lead solder from 20+ years ago no
problems.

What situations would be good to use the paste in?

It has a very valuable role in certain circs; I'll leave that to someone
else to expand on.



--
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.

I posted the question in the so called "advanced" group.

The responses looked as if they came from ex Barnum and Bailey clowns.

:)

Andy

Some people are too clever for help.
Click to expand...
 
On Tuesday, July 23, 2019 at 10:00:41 PM UTC-5, Rheilly Phoull wrote:
On 24/07/2019 9:01 am, AK wrote:
On Tuesday, July 23, 2019 at 12:07:24 PM UTC-5, Cursitor Doom wrote:
On Mon, 22 Jul 2019 20:21:17 -0700, AK wrote:

I am using up some old RS solder that has the paste already in it,
though it may have dried out quite a bit.

Shouldn't have. I'm still using old lead solder from 20+ years ago no
problems.

What situations would be good to use the paste in?

It has a very valuable role in certain circs; I'll leave that to someone
else to expand on.



--
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.

I posted the question in the so called "advanced" group.

The responses looked as if they came from ex Barnum and Bailey clowns.

:)

Andy

Some people are too clever for help.
Click to expand...

It's been a long day.

I do not understand your statement?

Andy
 
On Monday, July 22, 2019 at 8:21:20 PM UTC-7, AK wrote:
I recently received this and am learning about what applications it is good for.

https://imgur.com/3pGTm0a

I put a small amount on a project board and the solder seemed to adhere better.

I am using up some old RS solder that has the paste already in it, though it may have dried out quite a bit.

What situations would be good to use the paste in?

Thanks,
Andy
Click to expand...

The description on the container is far too vague for my taste. If you're using that on a PC board I don't trust it. An MG Chemicals 935-P flux pen is much preferred. At least you know what's in it.

G²
 
On Mon, 22 Jul 2019 20:21:17 -0700 (PDT), AK
<scientist77017@gmail.com> wrote:

I recently received this and am learning about what applications it is good for.

https://imgur.com/3pGTm0a

I put a small amount on a project board and the solder seemed to adhere better.

I am using up some old RS solder that has the paste already in it, though it may have dried out quite a bit.

What situations would be good to use the paste in?

Thanks,
Andy
Click to expand...

I think that is what we call "flux."

"Paste", in our business, actually has solder particles in it.

Get tid of that old Rat Shack stuff and but some good Kester RMA 63/37
solder.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics
 
On Wednesday, July 24, 2019 at 12:00:31 AM UTC-5, stra...@yahoo.com wrote:
On Monday, July 22, 2019 at 8:21:20 PM UTC-7, AK wrote:
I recently received this and am learning about what applications it is good for.

https://imgur.com/3pGTm0a

I put a small amount on a project board and the solder seemed to adhere better.

I am using up some old RS solder that has the paste already in it, though it may have dried out quite a bit.

What situations would be good to use the paste in?

Thanks,
Andy

The description on the container is far too vague for my taste. If you're using that on a PC board I don't trust it. An MG Chemicals 935-P flux pen is much preferred. At least you know what's in it.

G²
Click to expand...

I trust it.

And I am a retired scientists and part of my job was to test things.

:)
 
On Wednesday, July 24, 2019 at 6:59:11 PM UTC-7, AK wrote:

https://imgur.com/3pGTm0a

I put a small amount on a project board and the solder seemed to adhere better.
Click to expand...

So, it's probably the century-old formula of ZnCl2 suspended in petroleum jelly.
Paste flux of this sort is convenient for copper plumbing use, and is only
slightly messy, BUT isn't generally an electronics aid.

The chlorides will wash away with water flow, and it is common procedure
to use a rag to clean the exterior of each soldered copper pipe joint,
but if the stuff remains, it can corrode the metal parts (and it's hygroscopic,
so it attracts moisture that causes dissimilar-metal reactions).

More here: <https://yarchive.net/metal/soldering_flux.html>

Not recommended for fine wires or printed circuit (thin) sheet copper.
Folk have used it for vacuum piping, but (because it does NOT get
washed away) that's the beginning of a horror story...
 
On Thursday, July 25, 2019 at 2:56:03 AM UTC-5, whit3rd wrote:
On Wednesday, July 24, 2019 at 6:59:11 PM UTC-7, AK wrote:

https://imgur.com/3pGTm0a

I put a small amount on a project board and the solder seemed to adhere better.

So, it's probably the century-old formula of ZnCl2 suspended in petroleum jelly.
Paste flux of this sort is convenient for copper plumbing use, and is only
slightly messy, BUT isn't generally an electronics aid.

The chlorides will wash away with water flow, and it is common procedure
to use a rag to clean the exterior of each soldered copper pipe joint,
but if the stuff remains, it can corrode the metal parts (and it's hygroscopic,
so it attracts moisture that causes dissimilar-metal reactions).

More here: <https://yarchive.net/metal/soldering_flux.html

Not recommended for fine wires or printed circuit (thin) sheet copper.
Folk have used it for vacuum piping, but (because it does NOT get
washed away) that's the beginning of a horror story...
Click to expand...

Unfortunately, you are wrong again.

It has a ph of 7.0 +/- .3 which I verified myself with some ph test strips.

Andy
 
On Thursday, July 25, 2019 at 1:34:40 AM UTC-7, AK wrote:
On Thursday, July 25, 2019 at 2:56:03 AM UTC-5, whit3rd wrote:
probably the century-old formula of ZnCl2 suspended in petroleum jelly.
Click to expand...

Unfortunately, you are wrong again.

It has a ph of 7.0 +/- .3 which I verified myself with some ph test strips.
Click to expand...

It's water-soluble? pH test strips don't reveal much with petroleum jelly...
 
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