What is halogen-free solder paste? What are the characteristics?

I. What is halogen-free solder paste

What isHalogen-free solder paste? Let's analyze step by step. First of all, we all know what solder paste is, so let's focus on understanding what halogen-free is.

As the name suggests, "halogen-free" means it contains no halogen. Halogen elements include fluorine.FChlorineClBromineBrIodineIAnd astatineAtFive kinds. Among them, astatineAtHalogens are radioactive elements that we generally do not come into contact with. Therefore, the halogens we usually refer to are the four elements: fluorine, chlorine, bromine and iodine. These four elements exist in the product in the form of organic compounds, especially in polymer materials.

Halogens cause chronic harm to both human health and the environment. Therefore, the European Union currently has relevant regulations stipulating that most electronic products must be halogen-free.

Halogen-free solder paste is a product ofSMTThe processing production line is specially designed and manufactured for solder paste. Halogen-free solder paste can be reflow soldered in an air furnace or in nitrogen, and no cleaning is required after reflow. The unique active system of halogen-free solder paste ensures the elimination of various reflow soldering defects and also guarantees the long-term stability of the solder paste. Due to its environmental friendliness, halogen-free solder paste is now basically used in Europe and America.

Ii. Characteristics of Halogen-free Solder Paste

Environmentally friendly and non-toxic, free of halogens and other harmful substances;

It has good welding performance, strong weldability and full and bright weld points;

It can meet the requirements of welding equipment of different grades and can print continuously for a long time;

It has strong wetting performance, good moisture retention performance and can be printed continuously12More than one hour;

There is little rosin residue, and the residue is white and transparent;

Good printing fluidity, such asICSpacing0.4mmAll can work well;

The welding residue is minimal, the odor is low, the insulation resistance is high, and it does not corrode the circuit board, fully achieving the purpose of no cleaning;

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