JJY | Why is lead-free solder paste more expensive than leaded solder paste?

Solder pasteIt is mainly a paste-like mixture composed of solder powder and flux paste, used forSMTIn the field of production and processing, resistors, capacitors,ICWait for the surface mount electronic components to be solderedPCBOn the board. What are the differences between lead-free solder paste and leaded solder paste? Is lead-free solder paste necessarily better than leaded solder paste? Today, Shenzhen JJY Solder Paste Manufacturer will explain to you the differences between leaded solder paste and lead-free solder paste:

1The differences in appearance design and taste of solder paste

The color of leaded solder paste is blackish gray and it is bottled in milky white plastic bottles. The color of lead-free solder paste is grayish white. Lead-free solder paste followsRoHSThe common practice in the field is to use green plastic bottles for storage, which makes it easier for project technicians to distinguish them visually when using them.

2The differences in the ingredients of solder paste

The alloy composition of leaded solder paste is mainly composed of tin and lead, and their common proportions are:Sn:Pb=63:37;The alloy composition of lead-free solder paste: Taking lead-free high-temperature solder paste as an example, it is mainly composed of tin, copper and silver,Their proportion isSn:Ag:Cu=96.5:3:0.5or99:0.3:0.7.

3The difference between the melting point and the soldering temperature of solder paste

There is lead solder paste6337The melting point183℃Lead-free high temperature0307The melting point of solder paste217℃-227℃Lead-free high temperature305The melting point of solder paste217℃Therefore The soldering temperature of lead-free is higher than that of lead-containing. The peak value of the soldering temperature of lead-containing should be200℃-210℃The peak temperature of lead-free welding should be at235℃-245℃.

Shenzhen JJY Industrial Technology Co., Ltd. mainly engages in:LEDManufacturers of solder paste, lead-containing solder paste, lead-containing silver-containing solder paste, wave soldering strips, automatic soldering wires, etc.