How to make high-quality solder paste with your own hands

When soldering, it is very convenient to use solder paste. You can buy it or make it yourself. When heated, homemade paste flows better than factory paste. When soldering twists, it penetrates deeper, which ensures a reliable connection. Its use prevents overheating of parts, since when melted it changes color from dark to light, allowing you to react in time and remove the burner.
How to make high-quality solder paste with your own hands

Materials and tools:


  • a drill with a 40 mm cutting disc for wood or a file for metal;
  • disposable cups 0.5 l;
  • pestle and mortar;
  • solder;
  • soldering flux;
  • coarse salt;
  • starch;
  • 5 cc syringe;
  • insulin syringe;
  • heat-shrink tubing.

Preparation of solder paste


The solder rod needs to be rubbed into a fine powder. To do this, you can use a metal file, which takes a long time, or use a drill with a wood disc.
How to make high-quality solder paste with your own hands

Unlike a file, its teeth do not become clogged with solder. Since sawdust scatters when sawed with a drill, you will need to build a collection for it from a cut-off disposable glass.In this case, the solder itself must be in the bag to preserve all the powder.
How to make high-quality solder paste with your own hands

It is important to feed the rod onto the edge of the cutting disc at an acute angle, then it will be rubbed into finer dust. Be sure to keep your hands away from the disc.
How to make high-quality solder paste with your own hands

The resulting sawdust is poured into a mortar. Coarse salt is added to them and everything is rubbed with force with a pestle. As you grind, you need to add new salt, since the crystals of the old one are destroyed.
How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

Grinded sawdust is diluted in water. The salt dissolves, resulting in the remaining residue being crushed solder. To completely desalt it, you will need to rinse it a couple of times. After sediment has settled, the water is drained.
How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

Starch is diluted in a small amount of cold water. After stirring it to weigh all the particles, the solution is poured into boiling water.
How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

A little water is added to the wet sediment of solder filings. The mixture is stirred until the particles are weighed and poured into hot jelly. After very thorough stirring, the glass with the combined solutions is left alone until a precipitate forms.
How to make high-quality solder paste with your own hands

In a thick jelly mass, only heavy solder settles to the bottom. Its lighter small particles float to the top. The jelly is poured into another container so as not to disturb the sediment. The paste is made only from small floating particles. To extract them, you will need to add more water to the jelly to reduce the concentration of starch, thereby reducing the thickness. This will allow the suspension to sink a little. Afterwards, the top layer of the solution without solder powder must be drained. The procedure is repeated until the starch concentration becomes negligible and the precipitate begins to fall out quickly.
After rinsing the starch, the sediment of small particles of solder must be squeezed out by folding it into a napkin.After rough dehydration, the mass is dried in a paper tray. This battery will take 10 minutes. The dried sediment has stuck together lumps. You can rub them with your finger through a napkin.
How to make high-quality solder paste with your own hands

Soldering flux is added to dried fine sawdust. The flux/powder ratio is approximately 40/60 by volume. The ingredients are mixed into a paste.
How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

The paste is placed in a 5 mm medical syringe with an elongated piston. Its spout must be connected to the insulin syringe using heat-shrink tubing.
How to make high-quality solder paste with your own hands

Press the plunger of the large syringe to squeeze the paste into the insulin syringe. With this method, it will flow without forming air pockets.
Subsequently, the resulting paste can be squeezed out through a thin needle of a medical syringe, or a thicker one from flux. This will allow you to adjust the feed depending on the size of the parts being soldered. The advantage of this paste is its ability to penetrate deeply into small capillaries. Of course, it is not so easy to make, but the process is interesting, and soldering with it is a pleasure.
How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

Soldering LED.
How to make high-quality solder paste with your own hands

How to make high-quality solder paste with your own hands

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Comments (5)
  1. Guest vladimir
    #1 Guest vladimir Guests 2 July 2019 22:03
    1
    What garbage! Rosin + alcohol or solvent 647!!! That's it! Top class gumboil!!!
    1. Vita
      #2 Vita Guests 27 July 2019 20:57
      1
      If the material is heavy and the part is delicate, soldering acid (slightly moistened), a well-heated powerful soldering iron, order: tin, connect, rinse.
  2. Vyacheslav Kuzhakov
    #3 Vyacheslav Kuzhakov Guests 25 July 2019 06:44
    1
    NC-559 is not the best choice for tin, it is good for lead-free solder (for BGA soldering it is the best).
    RMA-218 smokes less and does not caramelize as much during prolonged soldering at one point.
  3. Siegfried
    #4 Siegfried Guests 28 May 2020 20:41
    1
    This makes sense if you are making 10 kilograms of pasta. It’s easier to buy one or two tubes. They don't cost much.
    1. Alex
      #5 Alex Guests 2 February 2021 13:42
      0
      Well, yes, it’s “inexpensive”, look at the price tag. And it can be stored for a year or two. The author also has a second preparation method, where he gets balls 10-30 microns in size, like the industrial design. Watch on YouTube.