What is the standard for "lead-free tin wire"? Is lead-free solder wire really lead-free?

"Lead-free tin wireWhat is the standard of "? Is lead-free solder wire really lead-free? Lead-free solder wire(sn99.3cu0.7)It is mainly applied to the welding of handcrafted soldering irons with strict environmental protection standards. Because it is specially made from high-purity raw materials and combined with corresponding flux components, it has good welding fluidity, less smoke and less spatter. It is widely used in the industrial production of environmentally friendly electronic device assembly.

Lead-free solder wire, also known as environmentally friendly tin wire, is mainly made by mixing aluminum alloys composed of chemical elements such as tin, copper and silver in a certain proportion with oxidation-resistant aluminum alloys, and then through high-temperature melting, extraction and impurity removal. It is then injected with rosin drugs and other soldering solvents by a hydraulic press, and finally drawn into the metal wire by a wire drawing machine. Lead-free solder wire, as the most popular soldering material in the current electronics industry, is it really free of heavy metals? What are its standards?

ROHSThe standard is established by the laws of EU countries, and its full name is the "Directive on the Restriction of the Use of Certain Hazardous Components in Electrical and Electronic Equipment".(Restriction of Hazardous Substances). This standard is in2003years2month13The announcement was made. After two years of adjustment and improvement, it was finally completed2006years7month1It was announced to be implemented on that day, mainly to standardize the material and processing technology standards of electronic and electrical equipment, making them more beneficial to human health and environmental protection.

Tin wire standard:Main parameters for the content of six harmful substances:

1Lead(Pb)In each homogeneous chemical substance, its content, calculated by weight, is less than1000PPM

2,(Hg)In each homogeneous chemical substance, its content, calculated by weight, is less than1000PPM

3Cadmium(Cd)In each homogeneous chemical substance, its content, calculated by weight, is less than100PPM

4Six prices(Cr6 )In each homogeneous chemical substance, its content, calculated by weight, is less than1000PPM

5"多"(PBBs)In each homogeneous chemical substance, its content, calculated by weight, is less than1000PPM

6Ether(PBDEs)In each homogeneous chemical substance, its content, calculated by weight, is less than1000PPM

Among the six harmful substances limited in the standard, "lead" is included. As China is a major producer and exporter, this standard cannot be ignored. This is because it is indeed beneficial to environmental protection. Therefore Our government has also formulated certain requirements, and thus lead-free soldering has come into our view. After understanding the reasons for the advent and development trend of lead-free solder, we return to the current question: whether "lead-free solder wire" is truly free of heavy metals. The answer is a complete negative. Lead-free solder wire is not truly free of heavy metals; it's just that the proportion of lead is extremely small and can basically be ignored, which is why it is called lead-free solder. The lead content of lead-free solder is1000PPMThe followingPPMisparts per millionThe abbreviation of, meaning a few parts per million.1000PPMThe following is the content.0.1%The following, therefore The lead content in lead-free solder wire is extremely low, causing almost no harm to the body.

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