The Decisive Parameters of Solder Paste Quality Are Revealed


Jan 20, 2023

If you are looking for high-quality products, please feel free to contact us and send an inquiry, email:

Tin powder and auxiliary composition SMT manufacturing relies on quality solder paste printing. Many factors affect the quality of solder paste’s printing. It is important to know the properties of solder dust, composition of solder and ratio of flux. These parameters will determine melting points, printability, weldability, quality of solder joints, and printing abilities. The tin powder-alloy components of a tin alloy should be as close as possible to being eutectic. It is calculated as the proportion of tin dust to flux expressed in the amount of paste. The viscosity, printing and print properties of solder paste are directly affected by the content of tin. In general, the content of tin powder is 7590%. Tin powder is 7590% in general. It is used for template printing and no-cleaning solder paste. The contents of the tin used in drip coating are lower at 7585 p>

The size, shape, and distribution of the tin powder particles

It is important to consider the size, shape, and uniformity of the tin powder particles in order to influence the properties. It is best to use smaller particles for solder paste printing, particularly when using high density products that have a narrow spacing. About 1/5th of the template opening is used for the diameter of a tin powder piece. While the pattern of solder paste printed with small particles alloy powder is very detailed, edge collapse can easily be caused by it. The potential for oxidation is greater due to small particles’ large surfaces. If the assembly density of the powder is low, it’s possible to choose a coarser alloy powder without having an impact on the printing ability. This can improve both the weldability as well as reduce the price for solder paste. Also, the form of the alloy powder can impact the paste‚Äôs printingability and weldability. Spherical-particle alloy paste has good printing properties, low viscosity and easy to collapse after printing. This makes it ideal for printing metal templates and narrow spacing screens. Spherical particles are small in size, have low oxygen levels, and have bright welding spots, all of which can be beneficial for improving welding quality. At present, however, they are mostly used.


Solder paste, a fluid that is highly thixotropic can be made to flow by external forces. It is the most important characteristic of solder paste. Viscosity can affect the printing performance. Viscosity has a major impact on the print quality. Too high viscosity will cause solder paste to not flow from the template hole. The percentage of tin in the paste also influences the paste viscosity. A large percentage of flux indicates a lower viscosity. Advanc3dmaterials (aka. Advanc3dmaterials is an advanced material. With over 12 years of experience, Advanc3dmaterials is an established global supplier and manufacturer for chemical materials. High quality Tin Powder are produced by our company. We can help you if the price is lower.
Inquiry us