Solder Paste - 50g (Lead Free)

Replacement:TOL-11790. This part has been discontinued by the supplier. This page is for reference only.

Solder Paste Stenciling is the easiest and quickest way to solder some of the trickier SMD components. Here at SparkFun, we use solder paste stenciling on pretty much all of our boards. It saves us a lot of time. But stenciling takes more than just a stencil and a dream... you're going to need some paste.

Ever since we started carrying leaded solder paste, we've been getting requests for an unleaded version. Well we've finally found a supplier for lead-free solder paste! These small 50g tubs are the same size as our leaded solder paste, the perfect amount to keep around for prototyping and hobby projects.

The composition of this paste is Sn:90%, Ag:3%, Cu:7%

Check out the Solder Paste Stenciling tutorial (and the video below), if you haven't already.

Solder Paste - 50g (Lead Free) Product Help and Resources


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Damage / about 12 years ago / 3

    Does this stuff need to be stored refrigerated like the leaded stuff after opening?

    • Hi, Thanks for checking with us on this. I looked over the datasheet. It mentions to "Keep under normal temperature and dry environment. Shelf life is 6 months. Temperatures < 40C ,Humidity 50 % RH. That document is unfortunately to low quality to be shared. We are working on getting a crisper copy.

  • Member #315292 / about 12 years ago / 1

    What kind of flux is in this paste? Is it no-clean or do I need to wash the board afterwards? Thanks.

  • seulater / about 12 years ago / 1

    This stuff is the worst i have ever used!!
    I have tired 6 different kinds and this stuff is so bad i am throwing it out, not even worth the jar it comes in. I am so glad i did not start out SMT sodering with this stuff. If i did i would have given up way to soon as i would have though i was doing something wrong.


  • Member #132032 / about 12 years ago / 1

    I would also like to see a temperature curve. I have everything I need to do a prototype, and I can load it all into my oven, just not sure what to set. I guess I'll have to try and see how it goes.

  • Member #38914 / about 12 years ago / 1

    Where is the temp curve chart for this ?

  • Member #367507 / about 12 years ago / 1

    Where can I get 500g of the lead free stuff? Yes, I need a lot.

  • RADNOR / about 12 years ago / 1

    If this paste can really hold good under 40C then it is a great deal, and the price is great for 50g of such paste.

  • Shiftmore / about 12 years ago / 1

    Has anyone used this with the hotplate method? The melting point for this stuff seems pretty high. I've tried a few rounds with both a store-bought hotplate and one with a digital temp controller and have yet to find the sweet spot that melts the solder and doesn't burn the board.

    I know absolutely nothing about solder paste, but most other lead free pastes I've seen on the innerwebs are at most .5% Cu.. The Wiki page on solder has a handy table showing the melting points of different compositions: The only lead free ones they list even approaching this amount of copper are around 3% and those are for "radiator repair"..

    The only way I've gotten this stuff to melt is with my hot air rework station blowing around 300C.

    Like I said, all I know on this subject is my handfull of attempts recently and what can be gleaned from a few googlings, so I could very well be doing something wrong here. It would be nice to know if anyone else has had any success.

  • QMan56 / about 12 years ago / 1

    Do you have a video for stencil making? And do you sell blank stencil components?

    • The only tutorial that comes in mind is our Solder Paste Stenciling tutorial. It goes more over how to use stencils, but it does mention that Pololu has SMT stencil service and where to get some other stencil items like mini-scrapers. You should be able to get some basic stencil materials at your local hardware store. We don't sell blank stencil material, but I will pass along as a product suggestion. Hope that helps!

  • phoenix710 / about 12 years ago / 1

    Do you have a link and/or PDF for the reflow oven time/temp curve? Thanks.

  • Erll / about 12 years ago / 1

    really? now? I just ordered the leaded stuff yesterday. I got tired of waiting. :-)

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