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Description: This is your basic spool of lead free solder with a water soluble resin core. 0.031" gauge and 100 grams. This is a good spool for more advanced users that should last 6-12 months depending on how often you solder.

If you are just beginning to solder, we recommend you order the leaded solder. Lead-free solder is a bit harder to use (does not flow as well).

Mix: 99.3% Sn / 0.7% Cu

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Comments 12 comments

  • This is great stuff. The metric gauge is 0.8mm, and according to the spool label the solder contains 2.5% flux. It’s thin enough for surface mount but not too thin to do big through-hole joints like USB socket holders. I use it as my all-around solder and haven’t had any problems.
    In my experience the solder works best at at least 650 F (350 C), and I usually put my iron around 700F (370 C) to make sure the joint gets hot enough. The solder flows well and made my transition to lead-free quite pleasant.
    I recommend this solder highly.

  • Is there a recommended temperature to set my iron when using this solder?

    • Yeah, the temperature at which you set your iron represents your personality. Careful and thoughtful people tend to set their irons to around 300-350C, while people who like to live life on the edge set their irons to 375C+.

    • It really depends on your iron and what you’re doing, and personal preference. I liked ~350 C.

  • Are the fumes of this as toxic as the ones from leaded solder?

    • An important thing to remember is that soldering temperatures are not hot enough to vaporize any of the metals in either leaded or unleaded solder. The smoke you see is always from the flux, which is in the core of the solder, or any you add yourself. To answer your question, the flux is the same in both products, so yes, the fumes are “as toxic” as each other. In regards to the toxicity, it’s not deadly, but also not something you should be breathing excessively. A small fan is a good way to keep the fumes away from your face while you’re soldering. It’s also important to note that the metals from both types of solder will get on your skin; always wash your hands thoroughly after soldering. You don’t want to ingest any while eating.

  • I love this solder. It leaves joints looking shiny and clean. There is little issues with it heating up at 650ยบ F. Just make sure the part is hot enough. I learned how to solder using this and it was a delight. I’ll be coming back for more.

  • Is this 60/40 mix?

    • It states in the description: Mix: 99.3% Sn / 0.7% Cu. So no, not even close to 60/40.. which generally refers to tin/lead content anyway and this is lead-free solder, as per the title :) Perhaps you commented on the wrong product, though?

  • shouldn’t the other solder be in related products?

  • I just got into electronics about a year ago and have been using leaded solder. I was worrying that switching to lead-free would be difficult but I was pleasantly surprised. This solder flows really well, it actually acts a lot like leaded solder (at least it does to me).


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