PCB News - Analysis of the causes of lead-free in the production of circuit boards ---------the harm of lead

Analysis of the causes of lead-free in the production of circuit boards---------the harm of lead

―, the hazards of lead
Lead has been used in various industries for more than a thousand years, and lead is used in the production of PCB circuit boards. At present, the global annual consumption is about 50 million tons, of which 81% is used for batteries, followed by lead oxide white paint and weapons, and the use of both is about 10%. They are the three major places where lead is used. In fact, it is only 0.49% for those who really use it in the manufacture of circuit boards and the soldering industry of electronic products. However, due to its too wide spread, and it is very difficult to recycle and reuse, the pollution hazard caused cannot be considered serious. ! The harm of lead can be seen from this

Lead is the "killer" of cells. When the blood lead concentration reaches 15 mg/100 ml, it will cause children's growth retardation and mental retardation, and the younger the age, the more serious the nerve damage. Lead poisoning manifests as excessive movement, excitement, poor sleep, loss of appetite, frequent urination, enuresis, irritability, moodiness, etc., and even poor auditory and language skills. The hazard of lead is very terrible, so lead-free production in the circuit board production can not be delayed.

Lead compounds can easily penetrate into groundwater and become a potential danger for drinking water. Take Japan as an example. Its environmental protection regulations require that the lead in groundwater should not exceed 0.3ppm (0.3mg/l). As for the United States, in its EPA40 CFR141, the lead content in drinking water is more stringent to an upper limit of only 15 ppb (0.015mg/l). For example, according to the TCLP poison dissolution test in the US Environmental Protection Agency EPA40 CFR261, the maximum dissolution amount of lead can only be analyzed to 5mg/l, and the lead in various solder joints in general circuit board production will be lost in nature after being discarded. The amount is hundreds of times higher than the above-mentioned dissolution test. The hazard of lead is so dangerous that it can not be cautious and fearful! Therefore, it is imperative to make lead-free circuit boards in electronic products.

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