Forums

Soldering paste

Started by AK July 23, 2019
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.
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.
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
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.
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.
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
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
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. > > G&sup2;
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.
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...
Unfortunately, you are wrong again. It has a ph of 7.0 +/- .3 which I verified myself with some ph test strips. Andy