Silver Solder. 15 Gram Packs

RayJay · Jul 11, 2014

Hi everyone,

I got a box of this Silver Solder today and want to offer it here.

It is thin enough to fit in an envelope so standard postage to the US and Canada is $3 and Australia is $1.

AUD$5 per 15 Gram Pack.

Pack in the photo is open and has been used so usually there is a few more rings of solder.

I have about 30 of these only and (probably) won't be getting any more. So get them while I have them!!

rhd · Jul 11, 2014

Where does it say what the contents are? I presume it contains some silver, but what else and how much?

RayJay · Jul 11, 2014

rhd said:
Where does it say what the contents are? I presume it contains some silver, but what else and how much?

It is 965 silver with the rest being Tin. So it's mostly silver. And it has an acid flux core.

-----------------
This is from the Cigweld website.

Comweld 965 Solder is a tin silver eutectic solder which has the highest strength of all soft solders making it the most universal of soft solders.
Applications
Used for the joining and repair of copper, bronze, brass, nickel, monel, steel stainless steel, pewter, chrome plate, metal sculpture, model making, costume jewellery and or a combination of metals with the exception of aluminium and magnesium.
------------------

I use it for most of my solder jobs. It is incredibly strong.

Also, being Silver it has the best electrical and thermal conductivity!

Pi R Squared · Jul 11, 2014

The kind that is used for electronics is only 2% or 4%, but this kind is usually 60, 65, 70, or 75% silver and requires a torch not a soldering iron.

Alan

RayJay · Jul 11, 2014

Pi R Squared said:
The kind that is used for electronics is only 2% or 4%, but this kind is usually 60, 65, 70, or 75% silver and requires a torch not a soldering iron.

Alan

I use it on electronics all the time with an iron and it is by far the best solder I have ever used.

Also, just found this on a spec sheet.

solder alloy, consisting of
tin 7440-31-5 >60% ^
silver 7440-22-4 <10% ^
flux core composed of
ammonium chloride 12125-02-9 <10% ^
unknown fluorides <10%

So it's <10% pure silver and >60% Tin.

COMMANDR · Jul 11, 2014

RayJay said:
I use it on electronics all the time with an iron and it is by far the best solder I have ever used.

Also, just found this on a spec sheet.

solder alloy, consisting of
tin 7440-31-5 >60% ^
silver 7440-22-4 <10% ^
flux core composed of
ammonium chloride 12125-02-9 <10% ^
unknown fluorides <10%

So it's <10% pure silver and >60% Tin.

Be sure to clean your work because ammonium chloride is corrosive!!!!

Corrosivity:
Extremely corrosive in presence of copper. Corrosive in presence of steel, of stainless steel(304). Slightly corrosive in
presence of aluminum, of stainless steel(316).
Special Remarks on Reactivity:
Incompatible with lead and silver salts. It can react violently with ammonium nitrate and potassium chlorate. Also incompatible
with bromine trifluoride, ammonium halides, bromine pentafluoride, alkalis and their carbonates. At fire temperature,
ammonium chloride may dissociate into ammonia and hydrogen chloride. Hygroscopic; keep container tightly closed.
Special Remarks on Corrosivity: Severe corrosive effect on brass and bronze.
Polymerization: Will not occur

FYI

Pi R Squared · Jul 11, 2014

That sounds right to me, at less than 10% silver then a soldering iron will still work fine. I used to make some jewelry in my spare time and I know there are silver solders with much higher percentages of silver, the higher the silver % the higher the melting point, but yes this solder would be great for electronics.

Alan

ARG · Jul 11, 2014

I don't know much about silver solder, why would I want to use silver solder over regular leaded stuff?

Pi R Squared · Jul 11, 2014

ARG said:
I don't know much about silver solder, why would I want to use silver solder over regular leaded stuff?

There are multiple formulas for special purposes but generally the reasons would be for soldering silver-metallized surfaces, for use at both elevated and cryogenic temperatures, solder joints where remelting when working on nearby joints is undesirable, it has greater strength, also for soldering stainless steel, and the resulting joints have a higher tolerance to vibration and stress.

Alan

Rifter · Jul 11, 2014

ARG said:
I don't know much about silver solder, why would I want to use silver solder over regular leaded stuff?

Its a lot stronger.

You can rip some small gauge wires soldered together apart by hand if you use regular 60/40 solder as the solder joint will fail and break .

Silver solder is much stronger you will be more likely to break the wire than the solder joint.

So I would use it in situations where the structural integrity of the joint is important.

Rifter · Jul 12, 2014

If you can hold one for a week im in for one.

busman2 · Jul 12, 2014

Thats a good price there Ray. I might get some to try it out on our Diving communications gear. PM sent.

RayJay · Jul 12, 2014

Rifter said:
If you can hold one for a week im in for one.

I'll send it to you on Monday and just pay when you're able to.

busman2 said:
Thats a good price there Ray. I might get some to try it out on our Diving communications gear. PM sent.

Done. PM Answered

paul1598419 · Jul 15, 2014

Acid flux should never be used on electronics. Even the package shows this solder being used for plumbing and other non-electronic purposes. Acid core flux causes oxidation of electrical connections over time. Look it up. Acid flux is a ticking time bomb on electrical connections.

Rifter · Jul 16, 2014

paul1598419 said:
Acid flux should never be used on electronics. Even the package shows this solder being used for plumbing and other non-electronic purposes. Acid core flux causes oxidation of electrical connections over time. Look it up. Acid flux is a ticking time bomb on electrical connections.

Would it not be ok as long as you rinse it well with 99%+ isopropyl?

paul1598419 · Jul 16, 2014

No, it won't work. The acid flux becomes part of the mixture and over time it will turn the copper green and corrode other metals as well. In time your traces will corrode and your copper connections will break down. That is why all electrical solder comes with a rosin core flux. Now, acid flux is used all the time on plumbing and sometimes the pipes are copper, but the difference is that copper tubing or pipe is thick and you are not making an electrical connection there. When you solder on electrical components you are making an electrical connection through the solder with usually copper traces and copper wire. The interface between these connections is what breaks down to copper oxides and become very resistive to current flow. So, that over time your electrical connection will no longer be a good connection for current flow.

Silver Solder. 15 Gram Packs

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