What is the difference between silver-containing lead-free solder paste and silver-free lead-free solder paste?

The main difference between Tin-lead solder with silver and Lead-free solder without silver lies in their composition and properties.

Lead-free solder paste with silver usually refers to lead-free solder paste containing a small amount of silver, the purpose of adding silver is to improve the fluidity of the solder paste and solder strength. The main component of this paste is an alloy of tin and silver, usually Silver content is around 0.5% to 2.5%.

As an environmentally friendly soldering material, lead-free solder paste consists of a mixture of environmentally friendly metal elements in different proportions, among which, tin, silver, copper and bismuth are common ingredients. So what is the difference between silver-containing lead-free solder paste and silver-free eco-friendly solder paste? Silver-containing solder paste and silver-free lead-free solder paste in common: are all lead-free solder paste series products, are also in line with the EU ROHS Directive, but there are several differences, the next by the Shenzhen Jiajinyuan solder paste manufacturers for you to introduce the specific differences.

First, the composition is different: silver-containing lead-free solder paste is composed of tin-silver-copper or tin-bismuth-silver alloy, it is like a shining star, rich in precious silver elements, and does not contain silver lead-free solder paste is composed of tin and copper or tin and bismuth elements.

Second, the melting point is different: due to the different metal alloys, the natural melting point is not the same. Containing 3.0 silver solder paste melting point is: 217 ° C, and does not contain silver tin-copper lead-free solder paste melting point is: 227 ° C, a difference of 10 ° C between the two, tin 42 bismuth 58 melting point is 138 ° C.

Third, the color of the solder joints are different: the light color of the solder joints will affect the beauty of the appearance of the solder joints and color. As silver is a matte metal, not very bright, so silver-containing solder paste solder joints slightly dark, matte color, while the solder joints do not contain silver lead-free solder paste color is brighter, showing a certain luster.

Fourth, the performance is different: due to the addition of silver elements, silver-containing solder paste than the non-silver lead-free solder paste solder joints firmness is higher, stronger and better, at the same time and the silver alloy is close to close to the eutectic, the highest reliability of the solder joints. In addition, electrical conductivity in the solder joints is also a very important indicator. Silver is a very good conductive metal, so silver-containing solder paste than lead-free solder paste without silver conductivity, thermal conductivity are better.

Fifth, the cost is different: due to the high price of silver metal, so silver-containing solder paste will cost more than lead-free solder paste without silver. This is the biggest advantage of copper lead-free solder paste.

Shenzhen Jiajinyuan Industrial Technology Co., Ltd. is specialized in producing various types of solder paste manufacturers. We provide: QFN climb tin rate high solder paste, zero-halogen solder paste, VOID cavity rate low solder paste, laser solder paste, washing solder paste, high reliability military aerospace power photovoltaic, etc. with Sn62Pb36Ag2 solder paste, Sn62.8Pb36.8Ag0.4 solder paste, 6337 solder paste, transparent and colorless LED high brightness anti-liberation monument solder paste, mini-LED/micro-LED Solid crystal solder paste, high reliability lead-free low-temperature solder paste, low-temperature solder paste for heat sinks, professional solder paste for hardware soldering, lead-free medium-temperature solder paste, lead-free high-temperature 0307/105/305 solder paste, and other soldering materials manufacturers. Our products are of good quality, reasonable price and good service, welcome to inquire and order.

Silver-free lead-free solder pastes, on the other hand, are lead-free solder pastes that do not contain silver, and their main component is an alloy of tin and other metals, such as zinc, bismuth, and anti-corrosion agents. The performance of this type of solder paste is similar to that of silver-containing lead-free solder paste, but it does not contain silver, which may have an impact on the environment and human health.

In practice, the choice between silver-containing and silver-free lead-free solder pastes depends on the specific soldering application and requirements. Silver-containing Pb-free solder pastes are typically used in applications that require high-intensity soldering, while silver-free Pb-free solder pastes are suitable for applications that require low-cost, low-toxicity and high reliability.