A Closer Look at Solder Paste

A Closer Look at Solder Paste


EMSL’s Windell Oskay plays around with solder paste, the er, soldering medium in paste form used in attaching surface mount components to PCBs. The part that particularly fascinated me was when Windell zoomed in on some paste with his microscope, revealing a multitude of tiny balls of solder suspended in goop:


When you really get down to it, the tiny bits of solder there really do look like the regular wire solder that you might use at your workbench. Only, they’re neatly round, and suspended in a liquid solder flux. After stenciling and placing the components, the circuit boards will be baked in a reflow oven until all those solder balls melt and fuse together, becoming roughly indistinguishable from solder that started out in a wire.

2 thoughts on “A Closer Look at Solder Paste

  1. Steve says:

    I would love to hear other peoples ideas on alternate uses for solder paste.
    Like using it to fill molds for casting small metal objects.

Comments are closed.

Discuss this article with the rest of the community on our Discord server!

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net

View more articles by John Baichtal
Maker Faire Bay Area 2023 - Mare Island, CA

Escape to an island of imagination + innovation as Maker Faire Bay Area returns for its 15th iteration!

Buy Tickets today! SAVE 15% and lock-in your preferred date(s).