I have a syringe of solder paste that is leaded, no clean.

I've had it a while and don't use it very often. But I usually keep it in the refrigerator. Is that necessary? Or, can I just leave it my utility drawer with everything else?


  • \$\begingroup\$ Typically solder paste gets used up before it gets old (e.g. in industry this is never a problem). Just buy it in smaller volumes and then you don't have to refrigerate it. \$\endgroup\$ – Wossname Dec 8 '16 at 8:26

Keeping solder paste refrigerated will maintain the viscosity of the carrier and prevent the spheres of solder from settling to the bottom of the container. So, yes.

  • \$\begingroup\$ Does that mean I should flip the container over from time to time? Especially if it sits in there for months without use? \$\endgroup\$ – cbmeeks Dec 8 '16 at 1:36
  • 1
    \$\begingroup\$ Give it a good stir every couple of months or so. \$\endgroup\$ – Ignacio Vazquez-Abrams Dec 8 '16 at 1:40
  • \$\begingroup\$ It's in a syringe. \$\endgroup\$ – cbmeeks Dec 8 '16 at 3:43

Honestly, I have never refrigerated my solder paste and have never had any problems. Just keep it out of direct sunlight.

I have been soldering 0.5mm pitch QFNs and 0402 passives for years.

EDIT: Also, I don't advise putting solder paste in a fridge with items that will be consumed.

  • \$\begingroup\$ I keep it in a sealed container that is on a plastic shelf with sides so nothing can leak. AND, the refrigerator I use is a small one that only contain sodas (and beer) and there is no way it could drip onto anything. But, I appreciate the tip. :-) \$\endgroup\$ – cbmeeks Dec 8 '16 at 3:42

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