Is it true that the smaller the different tin powder particles in solder paste, the better?

With the continuous development of surface mount technology, more and more people have begun to get involved in this industry. Newcomers who have just entered this industry are bound to encounter various problems. As an indispensable material for surface mount technologySolder pasteIt is no exception. Sometimes problems can occur at any time.

Many newcomers to the industry who have been in contact with it for a short time will notice a parameter when purchasing solder paste, that is, "solder powder type", and many merchants will also ask what number of powder is needed. People who are new to this industry may be completely confused and have many questions popping up in their minds. What is the type of tin powder? What's the difference? Today, JJY solder Paste Manufacturer will talk to you about the differences between different solder powder particles in solder paste and whether the better the solder powder particles are.

What is tin powder?

Solder paste is a new type of soldering material that emerged along with the development of surface mount technology. It is a paste-like mixture composed of tin powder, flux, thixotropic agent and other surfactants. The most important component among them is tin powder, which is a tiny spherical metal powder made of different types of alloys and plays the most crucial role in the welding process.

Common fan accounts available on the market:

The common types of tin powder currently available on the market are:2Followers3Followers4Followers5Subscribe.

2Powder solder paste, diameter of metallic tin powder:45～75μm;

3Powder solder paste, diameter of metallic tin powder:25～45μm;

4Powder solder paste, diameter of metallic tin powder:20～38μm;

5Powder solder paste, diameter of metallic tin powder:15～25μm;

The differences among different powder numbers

Generally, the larger the powder number of tin powder, the smaller its diameter. The smaller the diameter, the easier it is for the solder paste to roll off the openings of the steel mesh. That is to say, it is more likely to be printed onto the circuit board through the steel mesh and less likely to remain at the edge of the openings of the steel mesh. This can effectively improve the printing ability of fine pitch and achieve a consistent solder paste printing volume. In addition, smaller tin powder can also enhance its anti-collapse property and wetting effect.

Of course, although the smaller the diameter of the tin powder, the more likely it is to roll off the openings of the solder paste printed steel mesh, it is not the case that the smaller, the better. The smaller the diameter of the tin powder, the larger the area in contact with the air, and the more easily it is oxidized by the oxygen in the air. The oxidized solder paste is difficult to complete the entire soldering process. The specific selection still needs to be based on the characteristics of the products to be welded.2,3Due to its large diameter, high-grade powder is usually used in products with a relatively large distance between solder joints. while4,5Because the diameter of the powder is smaller, it is more suitable for dense welding, so it is often used for dense feetICWelding.

JJY Solder Paste Manufacturer mainly engages in lead-free solder paste.SMTSurface mount solder pasteLEDWe are engaged in the research and development, production and supply of solder pastes, lead-free solder wires, rosin solder wires, wave soldering rods, red glue and other solder materials. For more knowledge about electronic soldering, you can follow and contact us. Welcome to interact with us.