What are types of PCB manufacturing solder paste
What are the types of PCB manufacturing solder paste? PCB manufacturer will often use solder paste during smt process, but solder paste has a variety of different types, which need to choose suitable solder paste according to the processing product.
1.Lead and lead-free solder paste
Lead paste contains lead, which is harmful to the environment and human body. However, it has good welding effect and low cost. It can be used in PCB manufacturing electronic products without environmental protection requirements.Lead-free solder paste only contains trace amount of lead, which is less harmful to human body. It belongs to environmental protection products and is applied to environmental protection electronic products. abroad customers will require the using of lead-free solder paste for PCB manufacturing process.
2.High temperature solder paste, medium temperature solder paste and low temperature solder paste
A.High temperature solder paste, refers to the usual using of lead-free solder paste, melting point is generally above 217℃, with good welding effect.
B. The commonly used lead-free medium tin paste melting point is about 170℃ whose characteristics is the using of imported special rosin, with good adhesion, can effectively prevent collapse.
C.The melting point of the low-temperature solder paste is 138℃, and the low-temperature solder paste is mainly added with bismuth. When the mounting componentscannot withstand the temperature of 200℃ or above and the SMT reflow process is required, the low-temperature solder paste is used for the welding process to protect the componentsand PCB that cannot withstand the high temperature reflow welding, which is very popular in the LED industry.
3.tin powder particle size
According to the particle diameter of tin powder, tin paste can be divided into 1, 2, 3, 4, 5, 6 grades , of which 3, 4, 5 powder is the most commonly used.
The more sophisticated products, tin powder needs to be smaller, but the smaller the tin powder, will also increase the corresponding oxidation area of tin powder.In addition, the shape of the tin powder is round to improve the quality of printing.
The more difficult PCB SMT processing products are, the more important the choice of solder paste is. Only the suitable solder paste for PCB manufacturing products can effectively reduce the quality defects of solder paste printing, improving the quality of reflow welding, and reducing the cost of PCB manufacturing.
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