Solder pasteIt is one of the indispensable materials in the electric welding industry. Solder paste is divided into two types: lead-free solder paste and lead solder paste. Lead-free solder paste can be classified into high-temperature solder paste, medium-temperature solder paste and low-temperature solder paste. Facts have proved that it is classified by the melting point of solder paste. What are the differences between high-temperature solder paste and low-temperature solder paste? Let's have the solder paste manufacturer compare and analyze it for everyone:

1Firstly, the melting points of high-temperature solder paste and low-temperature solder paste are different: the melting point of high-temperature solder paste217-227℃The melting point of low-temperature solder paste is138℃. The working environment temperatures corresponding to different melting points are also different.

2The components of high-temperature solder paste and low-temperature solder paste are different: high-temperature solder paste is generally composed of alloy elements such as tin, silver and copper, while low-temperature solder paste is mainly composed of tin and bismuth alloys.

3The application fields of high-temperature solder paste and low-temperature solder paste are different: low-temperature solder paste is usually used for low-temperature components where the strength requirement is not very high and multiple reflow soldering is required. To avoid damaging the previous solder joints, low-temperature solder paste can be used, such as in the operation of high-frequency heads. High-temperature solder paste is used for welding and processing components that can withstand high temperatures. The welding requirements are high and the precision is high.BGA,QFNSuch electronic components.

4The difference between high-temperature solder paste and low-temperature solder paste during reflow soldering: Low-temperature solder paste is mostly used in the second reflow during the double-sided reflow soldering process. This is because the first reflow surface has larger components. When the same melting point solder paste is used in the second reflow, it is easy to damage the first reflow surface that has already been soldered(The secondary reflux through the furnace is inverted)Large components may experience false soldering or even fall off. Therefore, during the second reflow, low-temperature solder paste is generally used. When it reaches the melting point, the solder on the reflow surface during the first reflow will not melt again. But usuallyCHIPSimilar devices and small onesICIt is completely unnecessary because even if there is a secondary melting, the surface tension of the molten solder will not fall off. It is recommended to use solder paste with the same melting point.

5The performance of high-temperature solder paste and low-temperature solder paste soldering is different: the products soldered with high-temperature solder paste have stronger soldering firmness, while the products soldered with low-temperature solder paste have relatively lower firmness. The reason for this is due to the inherent characteristics of the bismuth element in the alloy composition. In addition, the solder joints soldered with high-temperature solder paste will turn a little yellow, while those soldered with low-temperature solder paste will not turn yellow.

6The packaging materials for high-temperature solder paste and low-temperature solder paste are different: The color of the packaging bottles used by manufacturers to distinguish high-temperature solder paste from low-temperature solder paste will be very distinct. This is because the performance of these two types of solder paste varies greatly in all aspects and cannot be mixed.

These are the knowledge summarized by the soldering manufacturer about the differences between low-temperature solder paste and high-temperature solder paste. When choosing solder paste, you can learn about it. JJY Factory mainly deals in lead-free solder paste.MTSurface mount solder pasteLEDSolder paste, solder wire, lead-free solder wire, rosin solder wire, lead-free solder bar, wave solder barSMTWe offer production and wholesale of welding products such as patch red glue. For more knowledge about welding, you can follow us, contact us and interact with us.