Everyone is well aware that there are many types of solder paste. Depending on different methods, the same type of solder paste can belong to different categories. It is generally divided into two types: lead-free solder paste and leaded solder paste. According to the different working temperatures, the same lead-free solder paste can be classified into lead-free high-temperature solder paste, lead-free medium-temperature solder paste and lead-free low-temperature solder paste. Are the classification standards often used by general solder paste manufacturers consistent with those of the users? Let's take a look at the following:

I. Solder paste is analyzed by alloy classification:

1Leaded solder paste(The generally applicable models are:Sn63/Pb37)Generally, it refers to the fact that lead metal is added as a composite material in solder paste. From a certain perspective, all solder pastes will contain lead metal components, only the amount of lead metal components varies. The classification of solder paste manufacturers: Lead solder paste is a kind of soldering process rich in lead metal, and the content of metal components in solder paste is not low. The frequently used product model is6337This is also the tin-lead ratio of eutectic solder.

2Lead-free solder paste (Generally applicable models are:Sn99Ag0.3Cu0.7In solder paste, there is also metallic lead as a material or the content of metallic lead is relatively low. In lead-free solder paste, the content of metallic lead should not exceed1000pPMIt means that the content of metallic lead in lead-free solder paste should not exceed1/1000.

Ii. Analysis of solder paste based on its operating temperature:

1Low-temperature solder paste (Generally applicable models are:Sn42Bi58This type of solder paste has a very low soldering temperature. The solder paste manufacturer has measured that the lowest temperature can be reached149At Celsius, the main composite materials are metallic tin and metallic bismuth. The content of metallic tin among them is42%The content of metallic bismuth is58%.

2Medium-temperature solder paste (generally applicable models are:Sn64Bi35Ag1.0The soldering temperature of this type of solder paste is relatively appropriate. The recommended temperature for solder paste manufacturers is178At Celsius, the key combination materials of this solder paste are metallic tin, bismuth and silver, among which the content of metallic tin is64%The content of metallic bismuth is35%The content of metallic silver is1%.

3High-temperature solder paste (Generally applicable models are:SAc0307andSAc305This type of solder paste is also a high-temperature solder paste. Its main component is metallic tin, and it also contains a small amount of metallic silver. The measured soldering temperature of the lead-free solder paste manufacturer is217Celsius.sac0307This lead-free solder paste contains a large amount of metallic tin99.7%The proportion of metallic silver components0.3%,So it is also called03Lead-free silver solder pastesaC305The metallic tin content in this lead-free solder paste accounts for97%The ones with metallic silver content are occupied3%Therefore, it is also called3Lead-free silver solder paste.

Iii. Solder paste is analyzed based on the diameter of the tin powder

2No. 1 powder solder paste, the diameter of the metallic tin powder is:45～75umIt usually refers to the metallic tin powder of the combined solder paste, with a diameter of45~75Within the micrometer range

3No. 1 powder solder paste, the diameter of the metallic tin powder is:25～45umIt usually refers to the metallic tin powder of the combined solder paste, with a diameter of25~45Between micrometers;

4No. 1 powder solder paste, the diameter of the metallic tin powder is:20～38umIt usually refers to the metallic tin powder of the combined solder paste, with a diameter of20~38Between micrometers;

5No. 1 powder solder paste, the diameter of the metallic tin powder is:15～25umIt usually refers to the metallic tin powder of the combined solder paste, with a diameter of15~25Between micrometers.

Through the aboveLead-free solder pasteA discussion of the actual production situation of the manufacturer shows that solder paste can be analyzed based on the various metal components used, as well as the significant differences in application working temperatures. The most astonishing aspect is that it can be analyzed based on the diameter of the tin powder used. Even if different classification standards are chosen, there are various types of solder paste, but there are still several very different names. Solder paste with these two nicknames must be of the same type. For related professional knowledge, please continue to follow the online message of JJY solder Paste Factory to interact with us!