The difference between leaded pcb and free lead pcb
date：2020-12-26 09:44:30
1. Solderability
The process melting point of the free lead PCB board is 218 degrees, and the melting point of the leaded PCB board is 183 degrees. The solderability of the free lead PCB board is higher than that of the lead-based soldering. The art firmness of the leaded PCB board is relatively poor, and the soldering is prone to false soldering. However, because the temperature of the leaded circuit board is relatively low, the thermal damage to the electronic product is less, and the PCB surface is brighter.
2. Cost difference
In the free lead circuit board process, the tin bars used in wave soldering and the tin wires used in manual soldering have increased the cost by about 3 times; the cost of solder paste in reflow soldering has increased by about 2 times.
3. Security
Lead is a toxic substance, and long-term use causes harm to human health and the environment.
Even if the lead PCB process has the characteristics of low price and brighter surface, but under the pressure of environmental protection policies in recent years, the living space of lead printed circuit boards has become smaller and smaller. The main reason is the sewage discharge of the PCB lead process. , And after the lead-containing PCB products are discarded, whether they are disposed of by burying or incineration, the lead component will eventually return to the environment through the media, causing serious lead pollution and bringing great harm to the environment and human survival.
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