How to choose low, medium and high lead-free solder paste? -- JJY Solder Paste Manufacturer

Low, medium, highLead-free solder pasteHow to choose? Nowadays, many solder paste manufacturers choose from. In the soldering industry, there are certain differences in solder paste formulas, production processes, and types. Among them, lead-free solder pastes can be roughly divided into low-temperature solder pastes and Medium-temperature solder paste and high-temperature solder paste. So many people will screen these several types. Each one has different processing conditions. So where are the specific characteristics and differences? The editor of JJY summarizes them for you as follows:

Low-temperature solder paste

Low-temperature solder paste, as the name suggests, has a relatively low melting point. Its main components are tin and bismuth, and it is added to the solder pasteBIAfter that, the temperature will drop its melting point138℃. Applicable to components that cannot withstand high temperatures orPCBLow-temperature solder paste has relatively poor solderability, brittle solder joints and dull luster.

Medium-temperature solder paste

The general melting point of medium-temperature solder paste172℃Its alloy composition isSn/Ag/Bi,The particle size of tin powder is between25～45umBetween. It is mainly used for the soldering of components that cannot withstand high temperatures.LEDIt is widely applied in various industries.; The main feature of medium-temperature solder paste is the use of imported special rosin,Good adhesion,It can effectively prevent collapse, with a small amount of residue after re-welding, which is transparent and does not cause any hindranceICTTest.

High-temperature solder paste

High-temperature solder paste has a relatively high requirement for temperature when passing through the furnace, and its melting point should be higher thanSN/BISolder paste, higher79℃The above main components are composed of tin, silver and copper, with a melting point of217℃-227℃That's all. It is widely used, has good weldability, is hard and firm, has good mechanical strength, and the weld points are bright.

Many people have asked me which is better, high temperature or low temperature?

What I want to tell everyone is that the use of high-temperature solder paste and low-temperature solder paste also depends on the product. For instance, if some products require low-temperature solder paste but you use high-temperature solder paste, it will lead to product defects, burning out and scrapping! 

The last question: Price difference? 

The price of solder paste does not depend on low or high temperature, but on the ingredients it contains. The prices of imported and domestic raw materials are different.

The solder paste of Shenzhen JJY brand has gone through many years12A solder paste and wire manufacturer specializing in the annual research and development of solder paste, solder wire, solder wire, lead-free solder paste, leaded solder paste, solder rods, leaded solder paste, etc. Choose the solder paste of JJY brandSolder paste manufacturer.