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How to judge whether a PCB board is a lead-free process?
In order to respond to the national environmental protection call and to ensure the output of green products, many factories are slowly adopting lead-free solder. But not all processing will use lead-free solder. After all, the commercial production of many PCB factories will consider cost, market, and supply issues, which will cause many manufacturers to more or less continue to use leaded processes.
PCBA processing gets a PCB circuit board, how do we judge whether the PCB board is a lead-free process? On this issue, let's take a look at the following aspects.
In terms of appearance: the surface of the circuit board with lead solder looks bright white first, while the lead-free solder shows a light yellow color (because the lead-free solder contains copper metal).
Hand feel: Wipe the solder with your hand. Lead-free solder will leave yellowish marks on your hands, while lead-free solder will leave black marks on your hands.
In terms of composition: Lead-containing solder is the two main factors containing tin and lead, while lead-free solder contains less than 500PPM). Lead-free solder generally contains tin, silver or copper metal elements.
Usage: Leaded solder is used for soldering of leaded products, and its tools and components are all leaded. Lead-free solder is used for the soldering of lead-free products exported to Europe, the United States and other countries. The tools and components used must be lead-free.
With the introduction of the above aspects, you can clearly and quickly identify whether it is a lead-free soldering process when facing the PCBA board.
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