Small knowledge of soldering station - why the melting point of solder paste is different?
Regarding the melting point of solder paste, different types of solder paste have different melting points. For example, the melting point of low-temperature solder paste is 138°C, while the melting point of high-temperature solder paste is 217°C. Why do solder pastes have different melting points? The following solder paste manufacturers will explain:
The melting point of pure tin is about 230°C. Generally speaking, the melting point of alloy materials (a mixture of two or more metals) is lower than that of single metals. According to the nature and content of alloy materials, their melting points are also different.
We say that where there is a market, there are different products. Solder paste, various solder pastes will be made with different additives for different needs, so their melting points will be different. Generally speaking, the melting point of lead 6337 is 183°C, the melting point of low-temperature tin-bismuth is 138°C, the melting point of medium temperature is 172°C, and the melting point of high temperature is 227°C and 217°C. High temperature solder paste has better soldering strength and shear force than low temperature solder paste. Low temperature solder paste is brittle and solder joints are brittle.
These are the melting points of the most common lead-free solder pastes:
The melting point of lead-free solder paste (0307) is 227°C,
The melting point of lead-free solder paste (105) is 221°C,
The melting point of lead-free solder paste (205) is 219°C,
The melting point of lead-free solder paste (305) is 217°C,
The medium temperature lead-free solder paste is conventionally Sn64Bi35Ag1, with a melting point of about 172°C.
Of course, there are also some unconventional lead-free solder pastes, and their melting points will vary due to different ingredients. We should notice the difference. For example, the melting point of low-temperature solder paste is 138°C, while the melting point of high-temperature solder paste is 217°C.
