How to tell whether a PCB board is lead-free or leaded?

In recent yearsLead-free solder pasteIt is widely applied in the electronics industry, and many people may wonder if there are many of themPCBAThe boards are all lead-free, and lead-free solder paste is used instead. In fact, it is not like that. Often, due to cost considerations or other issues, many circuit board manufacturers continue to use lead-containing processes. So how to distinguish one piecePCBIs the board lead-free or leaded? The solder paste manufacturer introduces several practical methods to everyone:

First of all, in terms of appearance, on the circuit board, the lead-containing surface appears to be the first bright white, while the lead-free surface is light yellow (because lead-free soldering contains copper metal).

The second type, in terms of touch, if you touch the solder with your hand, lead-free solder paste will leave a pale yellow mark on your body, while leaded solder will leave a black mark.

Thirdly, in terms of composition, lead is the main factor for tin and lead, while lead-free soldering has a lower lead content500PPMDue to the factors, lead-free substances generally contain metal elements such as tin, silver or copper.

Fourth, in terms of operation: Leaded solder is suitable for soldering lead-containing products, and the technical tools and components it uses are all lead-containing. Lead-free solder paste is suitable for soldering lead-free products exported to Europe, America and other regions. The technical tools and components it uses must be lead-free.

Through the above four methods, we can identify it relatively easilyPCBWhich solder paste soldering process was used for the board? For more technical questions about solder paste knowledge, you can follow the online message of JJY Solder Paste Manufacturer to interact with us.