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Description: We don't want to hype this solder TOO much, but this could possibly be the best solder in the world. There, we've said it. This is a special blend made specifically for us and we love it. It all started as a quest to find the best solder to use in our production process and ended up being the best we've tried. The best part is that it's lead free and has a water-soluble flux core.

This package contains 20 feet of solder and has a diameter of 0.032" (0.8mm).

Mix: 96.35% Sn (Tin), 3.0% Ag (Silver), 0.5% Cu (Copper), 0.15% Sb (Antimony).

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Comments 16 comments

  • Feel real inadequate to not know the ideal chemistry of solder.

  • made in usa, i like it :)

  • Does the flux have to be washed off a board like the old Kester organic flux solder (which corrodes if you don’t wash it)? Or can you use it for everything, washable and non-washable parts alike?

    • Somebody commented on the .020" sample that you should clean it with a wet Q-Tip or similar because it is corrosive.

  • 0.032" = 0.8mm not 0.5mm as noted in the description. Cut and paste error I think

  • What am I doing wrong with this solder? I used it to solder a header onto a breakout board. The solder did not flow well, and it seemed to frost a lot. I have no problems with the 63/37 mix.

    • 63/37 is a leaded solder - this is not.. you’ll want a higher temperature. 380°C worked well for me with the sample I got.

      • My iron has nothing to tell me the temperature, neither does it have a precise control. Maybe someday I can get a better station. Thanks.

  • Is it just me, or does this solder smell sweet when it burns? LOL, I’m trying my best to avoid its burning vapor, but DAMN it smells weird!

    BTW, for those who never tried this, this REALLY is the greatest solder ever (AFAIK). Somehow, it perfectly flows unto the holes and rarely sticks on your soldering iron (this is great for an utter klutz like me who shakes like insane and can’t solder for sh**)

    I just wish it wasn’t that expensive! Damn you, silver! Y u so expensive?! :P

    oh, btw, get the thinner one (.02") if you tend to oversolder things (blob wars) like me…

  • I feel Like I must ask, What differentiates this solder from regular solder? What, in the opinion of Spark-fun, makes this superior? I suppose I may be a solder Philistine because up until I read the description of this item I assumed one solder was just as good as another solder.

  • By my calculations, the mass of this 20-foot sample is about 23.6g. This is taking the densities of the primary constituents, tin and silver, to be about 7365 kg/m3 and 10490kg/m3 respectively. By comparison, the 1/4lb mini-spool of this blend is about 131.5g of solder and the 1lb spool accounts for 454g. You can compute the value-for-money quotients on your own.
    Conclusion: If you’re thinking about buying this solder blend, pick up the 1/4lb mini-spool instead, as it’s 5x better value (as of this writing.)

  • I hope Rob included some of THIS in my prize pack…

  • Surprisingly, the only good and cheap solder (2% Ag) that I could find was at the local Radio Shack.
    Will you sell thinner solder in the near future? (the Shack version is 0.015")
    What’s the melting point of this solder?

  • Antimony… who'da thunk it?
    I’ll take a roll, let’s see what this stuff can do…

  • This flows better than most leadless solder.


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